Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153…

cve CVE-2026-100808 2 sources, 2 claims · Watch

NVD writes:
Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157. the claim

Severity: high GitHub advisories
HIGH NVD
CVSS: 8.8 GitHub advisories
8.8 NVD
Vendor: Mozilla NVD
Product: Firefox NVD
CWE: CWE-693 GitHub advisories
CWE-693 NVD

How far exploitation has got

No public code known
Proof of concept
Proof of concept, verified
A Metasploit module
Exploited in the wild
Used in ransomware campaigns

Timeline

2026-09-29	first spoke of it: Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox...	GitHub advisories
2026-09-29	first spoke of it: Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.	NVD

Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

What it is to other things

affects	mozilla/firefox NVD
affects	mozilla/thunderbird NVD
made_by	mozilla NVD

Every value, with what each source said and its receipt

Property Source Said Means here

Automatable

automatable

NVD

At least one of those steps needs a person.

receipt

Source: NVD
Its words: no
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].automatable
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	no
2026-09-29 17:49 UTC	—

What the source handed over

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                "version": "153.4",
                "versionType": "rpm"
              },
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          {
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—

CVSS

cvss

GitHub advisories

8.8

receipt

Source: GitHub advisories
Its words: 8.8
Read by: field:cvss.score
Said since: 2026-10-02 11:59 UTC
Last answered: 2026-10-06 17:41 UTC
Original: open at the source

What the source handed over

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  "published_at": "2026-09-29T15:31:36Z",
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  "source_code_location": "",
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  "withdrawn_at": null
}

—

CVSS

cvss

NVD

8.8

receipt

Source: NVD
Its words: 8.8
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseScore || field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since: 2026-10-02 12:00 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-02 12:00 UTC	8.8
2026-09-29 17:49 UTC	—

What the source handed over

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}

—

CVSS vector

cvss_vector

NVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

receipt

Source: NVD
Its words: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.vectorString || field:cve.metrics.cvssMetricV31[].cvssData.vectorString
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
2026-09-29 17:49 UTC	—

What the source handed over

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        "type": "Secondary"
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}

—

CWE

cwe

GitHub advisories

CWE-693

receipt

Source: GitHub advisories
Its words: CWE-693
Read by: field:cwes[].cwe_id
Said since: 2026-10-02 11:59 UTC
Last answered: 2026-10-06 17:41 UTC
Original: open at the source

What the source handed over

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  "cve_id": "CVE-2026-100808",
  "cvss": {
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    "vector_string": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  },
  "cvss_severities": {
    "cvss_v3": {
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      "vector_string": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
    },
    "cvss_v4": {
      "score": 0.0,
      "vector_string": null
    }
  },
  "cwes": [
    {
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      "name": "Protection Mechanism Failure"
    }
  ],
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  "epss": {
    "percentage": 0.00159,
    "percentile": 0.04425
  },
  "ghsa_id": "GHSA-g3qf-g4gj-3c9g",
  "github_reviewed_at": null,
  "html_url": "https://github.com/advisories/GHSA-g3qf-g4gj-3c9g",
  "identifiers": [
    {
      "type": "GHSA",
      "value": "GHSA-g3qf-g4gj-3c9g"
    },
    {
      "type": "CVE",
      "value": "CVE-2026-100808"
    }
  ],
  "nvd_published_at": "2026-09-29T13:17:45Z",
  "published_at": "2026-09-29T15:31:36Z",
  "references": [
    "https://nvd.nist.gov/vuln/detail/CVE-2026-100808",
    "https://bugzilla.mozilla.org/show_bug.cgi?id=2063488",
    "https://www.mozilla.org/security/advisories/mfsa2026-100",
    "https://www.mozilla.org/security/advisories/mfsa2026-97",
    "https://www.mozilla.org/security/advisories/mfsa2026-101",
    "https://www.mozilla.org/security/advisories/mfsa2026-103",
    "https://github.com/advisories/GHSA-g3qf-g4gj-3c9g"
  ],
  "repository_advisory_url": null,
  "severity": "high",
  "source_code_location": "",
  "summary": "Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox...",
  "type": "unreviewed",
  "updated_at": "2026-10-01T18:33:44Z",
  "url": "https://api.github.com/advisories/GHSA-g3qf-g4gj-3c9g",
  "vulnerabilities": [],
  "withdrawn_at": null
}

—

CWE

cwe

NVD

CWE-693

receipt

Source: NVD
Its words: CWE-693
Read by: field:cve.weaknesses[].description[].value
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	CWE-693
2026-09-29 17:49 UTC	—

What the source handed over

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            "vendor": "Mozilla",
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      "ssvcV203": [
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        "tags": [
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-100/"
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-101/"
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      {
        "source": "security@mozilla.org",
        "tags": [
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
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    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
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        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

Exploitation

exploitation

NVD

none

No evidence of exploitation, and no public proof of concept.

receipt

Source: NVD
Its words: none
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].exploitation
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	none
2026-09-29 17:49 UTC	—

What the source handed over

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  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
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                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
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                "versionType": "rpm"
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        "source": "security@mozilla.org"
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              },
              {
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    "lastModified": "2026-10-05T14:52:50.827",
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            "privilegesRequired": "NONE",
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            "userInteraction": "REQUIRED",
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      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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                "technicalImpact": "total"
              }
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          }
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    "references": [
      {
        "source": "security@mozilla.org",
        "tags": [
          "Permissions Required"
        ],
        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2063488"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-100/"
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      {
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        "tags": [
          "Vendor Advisory"
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-101/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
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    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
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            "value": "CWE-693"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

Product

product

NVD

Firefox

receipt

Source: NVD
Its words: Firefox
Read by: field:cve.affected[].affectedData[].product
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
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                "versionEndExcluding": "153.4.0",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "CC64A654-10B5-4600-9E71-A2B276C5EAC3",
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                "versionStartIncluding": "154.0.0",
                "vulnerable": true
              },
              {
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                "matchCriteriaId": "652CBA63-DE2A-48A6-8C6A-D7D179197554",
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                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "8A93E2FC-CEDC-4074-B587-70CD89C5BC2B",
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              }
            ],
            "negate": false,
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    ],
    "cveTags": [],
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        "lang": "en",
        "value": "Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157."
      }
    ],
    "id": "CVE-2026-100808",
    "lastModified": "2026-10-05T14:52:50.827",
    "metrics": {
      "cvssMetricV31": [
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
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          "type": "Secondary"
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      "ssvcV203": [
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          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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    "references": [
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        "tags": [
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      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-100/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-101/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-693"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

Severity

severity

GitHub advisories

high

From 7.0 to 8.9.

receipt

Source: GitHub advisories
Its words: high
Read by: field:severity
Said since: 2026-10-02 11:59 UTC
Last answered: 2026-10-06 17:41 UTC
Original: open at the source

What the source handed over

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  "credits": [],
  "cve_id": "CVE-2026-100808",
  "cvss": {
    "score": 8.8,
    "vector_string": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  },
  "cvss_severities": {
    "cvss_v3": {
      "score": 8.8,
      "vector_string": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
    },
    "cvss_v4": {
      "score": 0.0,
      "vector_string": null
    }
  },
  "cwes": [
    {
      "cwe_id": "CWE-693",
      "name": "Protection Mechanism Failure"
    }
  ],
  "description": "Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.",
  "epss": {
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    "percentile": 0.04425
  },
  "ghsa_id": "GHSA-g3qf-g4gj-3c9g",
  "github_reviewed_at": null,
  "html_url": "https://github.com/advisories/GHSA-g3qf-g4gj-3c9g",
  "identifiers": [
    {
      "type": "GHSA",
      "value": "GHSA-g3qf-g4gj-3c9g"
    },
    {
      "type": "CVE",
      "value": "CVE-2026-100808"
    }
  ],
  "nvd_published_at": "2026-09-29T13:17:45Z",
  "published_at": "2026-09-29T15:31:36Z",
  "references": [
    "https://nvd.nist.gov/vuln/detail/CVE-2026-100808",
    "https://bugzilla.mozilla.org/show_bug.cgi?id=2063488",
    "https://www.mozilla.org/security/advisories/mfsa2026-100",
    "https://www.mozilla.org/security/advisories/mfsa2026-97",
    "https://www.mozilla.org/security/advisories/mfsa2026-101",
    "https://www.mozilla.org/security/advisories/mfsa2026-103",
    "https://github.com/advisories/GHSA-g3qf-g4gj-3c9g"
  ],
  "repository_advisory_url": null,
  "severity": "high",
  "source_code_location": "",
  "summary": "Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox...",
  "type": "unreviewed",
  "updated_at": "2026-10-01T18:33:44Z",
  "url": "https://api.github.com/advisories/GHSA-g3qf-g4gj-3c9g",
  "vulnerabilities": [],
  "withdrawn_at": null
}

—

Severity

severity

NVD

HIGH

From 7.0 to 8.9.

receipt

Source: NVD
Its words: HIGH
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseSeverity || field:cve.metrics.cvssMetricV31[].cvssData.baseSeverity
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	HIGH
2026-09-29 17:49 UTC	—

What the source handed over

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      {
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            "vendor": "Mozilla",
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      },
      {
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      },
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        "source": "security@mozilla.org",
        "tags": [
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    "vulnStatus": "Analyzed",
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}

high

Status

status

NVD

Analyzed

receipt

Source: NVD
Its words: Analyzed
Read by: field:cve.vulnStatus
Said since: 2026-10-05 18:25 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-05 18:25 UTC	Analyzed
2026-10-02 12:00 UTC	Awaiting Analysis
2026-09-29 17:49 UTC	Received

What the source handed over

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      {
        "affectedData": [
          {
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            "vendor": "Mozilla",
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              },
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              }
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          },
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    "vulnStatus": "Analyzed",
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        "type": "Secondary"
      }
    ]
  }
}

—

Technical impact

technical_impact

NVD

total

The attacker gains full control of the component, or all of its information.

receipt

Source: NVD
Its words: total
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].technicalImpact
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	total
2026-09-29 17:49 UTC	—

What the source handed over

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      {
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          {
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            "vendor": "Mozilla",
            "versions": [
              {
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                "status": "unaffected",
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                "versionType": "rpm"
              },
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                "status": "unaffected",
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                "versionType": "rpm"
              }
            ]
          },
          {
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            "vendor": "Mozilla",
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              },
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    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
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        "type": "Secondary"
      }
    ]
  }
}

—

Vendor

vendor

NVD

Mozilla

receipt

Source: NVD
Its words: Mozilla
Read by: field:cve.affected[].affectedData[].vendor
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

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            "vendor": "Mozilla",
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                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
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                "status": "unaffected",
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              },
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        "source": "security@mozilla.org"
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-693"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

Every claim, by kind

vulnerability

Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157. zetlyn/cve-nvd · 2026-09-29	automatable no cvss 8.8 cvss_vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H cwe CWE-693 exploitation none product Firefox severity HIGH status Analyzed technical_impact total vendor Mozilla	source
Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox... zetlyn/cve-ghsa · 2026-09-29	cvss 8.8 cwe CWE-693 severity high	source