Auth bypass in Microsoft Windows 10 1607
CVE-2026-54121
Improper authorization in Active Directory Certificate Services (AD CS) allows an authorized attacker to elevate privileges over a network.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (55.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Microsoft Windows 10 1607
- Microsoft Windows 10 1809
- Microsoft Windows 10 Version 1607 — versions 10.0.14393.0
- Microsoft Windows 10 Version 1809 — versions 10.0.17763.0
- Microsoft Windows Server 2012 — versions 6.2.9200.0
- Microsoft Windows Server 2012 — versions r2
- Microsoft Windows Server 2012 R2 — versions 6.3.9600.0
- Microsoft Windows Server 2012 R2 (Server Core Installation) — versions 6.3.9600.0
- Microsoft Windows Server 2012 (Server Core Installation) — versions 6.2.9200.0
- Microsoft Windows Server 2016 — versions 10.0.14393.0
Weakness classification (CWE)
Public proof-of-concept exploits
- aniqfakhrul/CVE-2026-54121
- ZeroDayEvil/CVE-2026-54121-Certighost
- tc4dy/CVE-2026-54121-PoC-Exploit
- ZeroDayEvil/CVE-2026-54121
- marcgoam/CVE-2026-54121-CertiGhost
- nafiez/Metasploit-CVE-2026-54121-Certighost
- 0xBlackash/CVE-2026-54121
- TryA9ain/Certighost_CVE-2026-54121
- KrakenEU/CVE-2026-54121-CertiGhost
- ChPratik/CVE-2026-54121
References
- Active Directory Certificate Services Elevation of Privilege Vulnerability (vendor-advisory, Patch, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-54121?
- CVE-2026-54121 is a high-severity vulnerability in Microsoft Windows 10 1607, classified under Improper Authorization. CVSS score: 8.8/10. Published 2026-07-14.
- How severe is CVE-2026-54121?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2026-54121 known to be exploited?
- 17 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.