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CVE-2026-88823VulnerabilityPublished

Microsoft · AES-GCM-SIV AAD Forgery After Zero-length Incremental AAD Update

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-88823· High

Not known to be exploited · fixed in 4.1.1 : patch Microsoft soon.

Data as of 15 Nov 2026, 10:24 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in 4.1.1, 4.0.4, 3.5.10

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 14 Nov 2026.

What to do

Upgrade OpenSSL to 4.1.1, 4.0.4 or 3.5.10.

Affected software

ProductAffectedFixed in
OpenSSLOpenSSLAffected
  • >=4.1.0 <4.1.1
Fixed in
  • 4.1.1
OpenSSLOpenSSLAffected
  • >=4.0.0 <4.0.4
Fixed in
  • 4.0.4
OpenSSLOpenSSLAffected
  • >=3.5.0 <3.5.10
Fixed in
  • 3.5.10

Description

CVE-2026-88823 is a vulnerability in Microsoft product version 3.0 involving AES-GCM-SIV authenticated encryption. It relates to an AAD (Additional Authenticated Data) forgery issue triggered after a zero-length incremental AAD update. No CVSS score or detailed impact information is provided.

References

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