Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network.

cve CVE-2026-96940 2 sources, 2 claims · Watch

NVD writes:
Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network. the claim

What it is to other things

In words only, so not counted until a person confirms one:

affectsmicrosoft/microsoft_exchange_server_2016_cumulative_update_23
NVD says “Microsoft · Microsoft Exchange Server 2016 Cumulative Update 23”
made_bymicrosoft
NVD says “Microsoft”

What each source says

PropertySourceSaidMeans here
Cvss
cvss
GitHub advisories8.8
receipt
Source
GitHub advisories
Its words
8.8
Read by
field:cvss.score
Said since
2026-10-03 00:02 UTC
Last answered
2026-10-04 18:15 UTC
Original
open at the source
What the source handed over
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  "cvss": {
    "score": 8.8,
    "vector_string": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  },
  "cvss_severities": {
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      "score": 8.8,
      "vector_string": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    },
    "cvss_v4": {
      "score": 0.0,
      "vector_string": null
    }
  },
  "cwes": [
    {
      "cwe_id": "CWE-1390",
      "name": "Weak Authentication"
    }
  ],
  "description": "Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network.",
  "ghsa_id": "GHSA-q9jh-jffv-9xvh",
  "github_reviewed_at": null,
  "html_url": "https://github.com/advisories/GHSA-q9jh-jffv-9xvh",
  "identifiers": [
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    }
  ],
  "nvd_published_at": "2026-10-02T19:16:43Z",
  "published_at": "2026-10-02T21:32:05Z",
  "references": [
    "https://nvd.nist.gov/vuln/detail/CVE-2026-96940",
    "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96940",
    "https://github.com/advisories/GHSA-q9jh-jffv-9xvh"
  ],
  "repository_advisory_url": null,
  "severity": "high",
  "source_code_location": "",
  "summary": "Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate...",
  "type": "unreviewed",
  "updated_at": "2026-10-02T21:32:13Z",
  "url": "https://api.github.com/advisories/GHSA-q9jh-jffv-9xvh",
  "vulnerabilities": [],
  "withdrawn_at": null
}
—
Cvss
cvss
NVD8.8
receipt
Source
NVD
Its words
8.8
Read by
field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since
2026-10-03 00:06 UTC
Last answered
2026-10-04 18:16 UTC
Original
open at the source
What the source handed over
{
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      {
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          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server 2016 Cumulative Update 23",
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            "product": "Microsoft Exchange Server 2019 Cumulative Update 15",
            "vendor": "Microsoft",
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              {
                "lessThan": "15.02.1748.053",
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          {
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          },
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      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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}
—
Cwe
cwe
GitHub advisoriesCWE-1390
receipt
Source
GitHub advisories
Its words
CWE-1390
Read by
field:cwes[].cwe_id
Said since
2026-10-03 00:02 UTC
Last answered
2026-10-04 18:15 UTC
Original
open at the source
What the source handed over
{
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  "credits": [],
  "cve_id": "CVE-2026-96940",
  "cvss": {
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    "vector_string": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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    },
    "cvss_v4": {
      "score": 0.0,
      "vector_string": null
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  },
  "cwes": [
    {
      "cwe_id": "CWE-1390",
      "name": "Weak Authentication"
    }
  ],
  "description": "Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network.",
  "ghsa_id": "GHSA-q9jh-jffv-9xvh",
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  "nvd_published_at": "2026-10-02T19:16:43Z",
  "published_at": "2026-10-02T21:32:05Z",
  "references": [
    "https://nvd.nist.gov/vuln/detail/CVE-2026-96940",
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    "https://github.com/advisories/GHSA-q9jh-jffv-9xvh"
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}
—
Product
product
NVDMicrosoft Exchange Server 2016 Cumulative Update 23
receipt
Source
NVD
Its words
Microsoft Exchange Server 2016 Cumulative Update 23
Read by
field:cve.affected[].affectedData[].product
Said since
2026-10-03 00:06 UTC
Last answered
2026-10-04 18:16 UTC
Original
open at the source
What the source handed over
{
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      {
        "affectedData": [
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Microsoft Exchange Server 2016 Cumulative Update 23",
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          },
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—
Severity
severity
GitHub advisorieshigh
From 7.0 to 8.9.
receipt
Source
GitHub advisories
Its words
high
Read by
field:severity
Said since
2026-10-03 00:02 UTC
Last answered
2026-10-04 18:15 UTC
Original
open at the source
What the source handed over
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—
Status
status
NVDReceived
receipt
Source
NVD
Its words
Received
Read by
field:cve.vulnStatus
Said since
2026-10-03 00:06 UTC
Last answered
2026-10-04 18:16 UTC
Original
open at the source
What the source handed over
{
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      {
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          {
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—
Vendor
vendor
NVDMicrosoft
receipt
Source
NVD
Its words
Microsoft
Read by
field:cve.affected[].affectedData[].vendor
Said since
2026-10-03 00:06 UTC
Last answered
2026-10-04 18:16 UTC
Original
open at the source
What the source handed over
{
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      {
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          {
            "platforms": [
              "x64-based Systems"
            ],
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            "vendor": "Microsoft",
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            "vendor": "Microsoft",
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                "status": "affected",
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    ],
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    "lastModified": "2026-10-02T21:16:58.060",
    "metrics": {
      "cvssMetricV31": [
        {
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            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-10-02T20:14:42.856638Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-10-02T19:16:43.023",
    "references": [
      {
        "source": "secure@microsoft.com",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96940"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Received",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-1390"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}
—

vulnerability

Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network.
zetlyn/cve-nvd · 2026-10-02
cvss 8.8 product Microsoft Exchange Server 2016 Cumulative Update 23 status Received vendor Microsoft source
Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate...
zetlyn/cve-ghsa · 2026-10-02
cvss 8.8 cwe CWE-1390 severity high source