firefox: Site isolation issue in the Reader Mode component

cve CVE-2026-92068 2 sources, 2 claims · Watch

Red Hat writes:
firefox: Site isolation issue in the Reader Mode component the claim

Severity they disagree: MEDIUM NVD
low Red Hat
CVSS they disagree: 5.4 NVD
3.4 Red Hat
Vendor: Mozilla NVD
Product: Firefox NVD
CWE: CWE-346 NVD
CWE-653 Red Hat

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

Why the CVSS differs

Metric	NVD	Red Hat
Attack vector AV	network N	network N
Attack complexity AC	low L	high H
Privileges required PR	none N	none N
User interaction UI	required R	required R
Scope S	unchanged U	changed C
Confidentiality C	low L	low L
Integrity I	low L	none N
Availability A	none N	none N

Each source scores the same vulnerability from what it judges the attack to need. The rows marked are where they judge it differently.

Timeline

2026-09-15	first spoke of it: Site isolation issue in the Reader Mode component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.	NVD
2026-09-15	first spoke of it: firefox: Site isolation issue in the Reader Mode component	Red Hat

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 09:45 UTC	—

What the source handed over

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  "cve": {
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      {
        "affectedData": [
          {
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            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
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                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
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                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
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        "type": "Secondary"
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  }
}

—

CVSS

cvss

conflict

NVD

5.4

receipt

Source: NVD
Its words: 5.4
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseScore || field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since: 2026-09-29 09:45 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": [
              {
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                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
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                "vulnerable": true
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      }
    ],
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    "lastModified": "2026-10-05T19:41:33.873",
    "metrics": {
      "cvssMetricV31": [
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    "references": [
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}

—

CVSS

cvss

conflict

Red Hat

3.4

receipt

Source: Red Hat
Its words: 3.4
Read by: field:cvss3_score
Said since: 2026-09-29 09:44 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-92068",
  "CWE": "CWE-653",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2533782",
  "bugzilla_description": "firefox: Site isolation issue in the Reader Mode component",
  "cvss3_score": "3.4",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-15T12:34:29Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-92068.json",
  "severity": "low"
}

—

CVSS vector

cvss_vector

not compared

NVD

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

receipt

Source: NVD
Its words: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
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:L/I:L/A:N
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "configurations": [
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        "type": "Secondary"
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  }
}

—

CVSS vector

cvss_vector

not compared

Red Hat

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

receipt

Source: Red Hat
Its words: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N
Read by: field:cvss3_scoring_vector
Said since: 2026-10-06 13:01 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

2026-10-06 13:01 UTC	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N
2026-09-29 09:44 UTC	—

What the source handed over

{
  "CVE": "CVE-2026-92068",
  "CWE": "CWE-653",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2533782",
  "bugzilla_description": "firefox: Site isolation issue in the Reader Mode component",
  "cvss3_score": "3.4",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-15T12:34:29Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-92068.json",
  "severity": "low"
}

—

CWE

cwe

different words

NVD

CWE-346

receipt

Source: NVD
Its words: CWE-346
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-346
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
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            "integrityImpact": "LOW",
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          },
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  }
}

—

CWE

cwe

different words

Red Hat

CWE-653

receipt

Source: Red Hat
Its words: CWE-653
Read by: field:CWE
Said since: 2026-09-29 09:44 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

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  "CWE": "CWE-653",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2533782",
  "bugzilla_description": "firefox: Site isolation issue in the Reader Mode component",
  "cvss3_score": "3.4",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-15T12:34:29Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-92068.json",
  "severity": "low"
}

—

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 09:45 UTC	—

What the source handed over

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}

—

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

2026-09-29 17:49 UTC	Firefox
2026-09-29 09:45 UTC	—

What the source handed over

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              },
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                "status": "unaffected",
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                "versionType": "rpm"
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    "vulnStatus": "Analyzed",
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        "type": "Secondary"
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}

—

Severity

severity

conflict

NVD

MEDIUM

From 4.0 to 6.9.

receipt

Source: NVD
Its words: MEDIUM
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	MEDIUM
2026-09-29 09:45 UTC	—

What the source handed over

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          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-94/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-96/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-346"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

medium

Severity

severity

conflict

Red Hat

low

A flaw that is unlikely to be exploited, or whose impact is minimal.

receipt

Source: Red Hat
Its words: low
Read by: field:severity
Said since: 2026-09-29 09:44 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-92068",
  "CWE": "CWE-653",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2533782",
  "bugzilla_description": "firefox: Site isolation issue in the Reader Mode component",
  "cvss3_score": "3.4",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-15T12:34:29Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-92068.json",
  "severity": "low"
}

—

Status

status

NVD

Analyzed

receipt

Source: NVD
Its words: Analyzed
Read by: field:cve.vulnStatus
Said since: 2026-10-06 00:34 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 00:34 UTC	Analyzed
2026-09-29 09:45 UTC	Awaiting Analysis

What the source handed over

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              },
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          "impactScore": 2.5,
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        }
      ],
      "ssvcV203": [
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          "ssvcData": {
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-94/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
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        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-96/"
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    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
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        "type": "Secondary"
      }
    ]
  }
}

—

Technical impact

technical_impact

NVD

partial

The attacker gains limited control, or limited information.

receipt

Source: NVD
Its words: partial
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	partial
2026-09-29 09:45 UTC	—

What the source handed over

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      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
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                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
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                "versionType": "rpm"
              }
            ]
          },
          {
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            "vendor": "Mozilla",
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                "status": "unaffected",
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                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
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            ]
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            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
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          "impactScore": 2.5,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-92068",
            "options": [
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                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
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              }
            ],
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    "references": [
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        "source": "security@mozilla.org",
        "tags": [
          "Permissions Required"
        ],
        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2058790"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-90/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-93/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-94/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-96/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
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          {
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            "value": "CWE-346"
          }
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "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

2026-09-29 17:49 UTC	Mozilla
2026-09-29 09:45 UTC	—

What the source handed over

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  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "configurations": [
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    "cveTags": [],
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    "lastModified": "2026-10-05T19:41:33.873",
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            "integrityImpact": "LOW",
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      "ssvcV203": [
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        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-94/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-96/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

Every claim, by kind

vulnerability

firefox: Site isolation issue in the Reader Mode component zetlyn/cve-redhat · 2026-09-15	cvss 3.4 cvss_vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N cwe CWE-653 severity low	source
Site isolation issue in the Reader Mode component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3. zetlyn/cve-nvd · 2026-09-15	automatable no cvss 5.4 cvss_vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N cwe CWE-346 exploitation none product Firefox severity MEDIUM status Analyzed technical_impact partial vendor Mozilla	source