Deserialization in Microsoft Entra
CVE-2026-69836
Deserialization of untrusted data in Microsoft Entra ID allows an unauthorized attacker to execute code over a network.
Vulnerability class: Insecure Deserialization
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
Affected products
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
References
- secure@microsoft.com (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-69836?
- CVE-2026-69836 is a critical-severity vulnerability in Microsoft Entra, classified under Deserialization of Untrusted Data. CVSS score: 10.0/10. Published 2026-08-20.
- How severe is CVE-2026-69836?
- Critical severity. CVSS v3 base score is 10.0 out of 10.
- Is CVE-2026-69836 known to be exploited?
- Yes. CVE-2026-69836 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-08-21), indicating it is being actively exploited.