Vulnerability intelligence
CVE-2026-54121
Improper authorization in Active Directory Certificate Services (AD CS) allows an authorized attacker to elevate privileges over a network.
CVSS Score
8.8
High
EPSS — Exploit Probability
1.8%
Riskier than 77% of all CVEs · checked 2026-09-12
Exploitation
Not in CISA KEV
KEV does not include every exploited vulnerability
Remediation
Patch available
Vendor fix published
2 articles across 2 outlets · first covered Jul 28, 2026 · latest Jul 29, 2026
Coverage timeline
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Low priv users hijack the DCs via CVE-2026-54121 flawsecurityonline.info · Jul 29, 2026
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Microsoft addresses critical AD Cert Services bug CVE-2026-54121www.darkreading.com · Jul 28, 2026