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Active Directory Certificate Services Improper Output Encoding Elevation of Privilege
CVE-2026-69821 is an elevation-of-privilege vulnerability in Active Directory Certificate Services (AD CS) caused by improper encoding or escaping of output. A locally authorized attacker can exploit the flaw to elevate privileges within the same security authority.
What it means and what to do now: patch path, interim mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
Successful exploitation enables elevation from low privileges to SYSTEM privileges. This provides high-impact compromise of confidentiality, integrity, and availability on the affected system.
Patch, then assume compromise.
Apply the official Microsoft security fix for CVE-2026-69821.
No public exploits tracked yet. Mallory keeps watching.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.