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CVE-2026-34182VulnerabilityPublished Updated

Microsoft · CMS AuthEnvelopedData Processing May Accept Forged Messages

Affects MicrosoftSource GCVE Database

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Not known to be exploited.

Data as of 29 Oct 2026, 19:04 UTC

Severity
Medium

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS
1.0% chance of exploitation in 30 days – higher than 64% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 2 Jun 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 29 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Microsoft Security Response Center MicrosoftAffected
  • =3.0
  • =edk2
Fixed in–

AI-suggested

Users should monitor official Microsoft Security Response Center updates for patches or workarounds.

Description

A vulnerability identified as CVE-2026-34182 affects Microsoft products involving CMS AuthEnvelopedData processing, which may accept forged messages. The issue relates to improper validation that could allow acceptance of maliciously crafted messages. No CVSS score is provided, and no public exploit or patch information is currently available.

Reports on CVE-2026-34182

References

Community reviews

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