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Vulnerabilities

Vulnerability · CVE-2026-21531

Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network.

Published Feb 10, 2026 · catalog updated Aug 19, 2026 · Microsoft Azure AI Language Authoring

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-21531. EPSS is 2.58%. Act only if a listed version of Microsoft Azure AI Language Authoring is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.58%
Remediation
Version ranges on file
Affected products
vendor Microsoft Azure AI Language Authoring 1.0.0 <1.0.0b4

Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Microsoft Azure AI Language Authoring 1.0.0 <1.0.0b41.0.0 <1.0.0b4

How to fix CVE-2026-21531

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-21531. EPSS is 2.58%. Act only if a listed version of Microsoft Azure AI Language Authoring is installed.

Which versions are affected?

Compare what you have installed with Microsoft Azure AI Language Authoring 1.0.0 <1.0.0b4 1.0.0 <1.0.0b4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 2.58%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 10, 2026 · EUVD

    Detected

    Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network.

  2. Aug 19, 2026 · EUVD

    Updated

    Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network.

Sources

  • CVE.orgVulnerability recordCVE-2026-21531

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-21531

    30-day exploitation probability 2.58%

    first.org
  • EUVDVulnerability recordEUVD-2026-7338

    Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 5, 2026
  • CVE.orgNov 4, 2026
  • EUVDNov 2, 2026