Wire · technology
Proof-of-concept exploit released for Certighost Windows AD CS vulnerability
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Fusion42 · 28 July 2026 · Fusion42 review
A proof-of-concept exploit for CVE-2026-54121 (Certighost) in Windows Active Directory Certificate Services has been released, allowing authenticated attackers to impersonate domain controllers and compromise entire Windows domains. Microsoft patched the vulnerability in July 2026 by adding validation to the certificate authority's chase process.
This Wire brief sits within Fusion42's coverage of Cybersecurity, and 3 sources have reported it between 24 Jul 2026 and 28 Jul 2026.
◆ ◆ The Wire takeaway
Your entire customer base running Windows domains is now at active risk: the exploit automating domain takeover is public, and the window between now and full patch deployment across enterprises is your moment to sell detection or response tools. Enterprise security teams will spend the next 90 days in emergency mode—your IR and visibility products become non-negotiable.
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3 sources · first reported 24 Jul 2026 · latest 28 Jul 2026
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