VulnerabilityAnalyzed
CVE-2026-21531
Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network.
CRITICAL 9.8EPSS 2.43%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.43%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.43% probability · 83th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-502
- Affected
- microsoft/azure conversation authoring client library
- Source
- secure@microsoft.com
References
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.