--- title: Certighost (CVE-2026-54121) | daily.dev description: CVE-2026-54121 (Certighost) is a vulnerability in Active Directory Certificate Services (AD CS) that allows a low-privileged domain user to impersonate a... canonical: https://daily.dev/posts/certighost-cve-2026-54121--axfow8dnw twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Certighost (CVE-2026-54121) | daily.dev og:description: CVE-2026-54121 (Certighost) is a vulnerability in Active Directory Certificate Services (AD CS) that allows a low-privileged domain user to impersonate a... og:url: https://daily.dev/posts/certighost-cve-2026-54121--axfow8dnw og:image: https://api.daily.dev/og/posts/AxFow8dNw.png og:image:alt: Certighost (CVE-2026-54121) og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Certighost (CVE-2026-54121) **[Abdul Rauf](https://daily.dev/sources/8bk3r1fnslw6a2yunhsln)** · [@raufus9799](https://daily.dev/raufus9799) · 1 min read · 0 upvotes · 0 comments ## Summary CVE-2026-54121 (Certighost) is a vulnerability in Active Directory Certificate Services (AD CS) that allows a low-privileged domain user to impersonate a Domain Controller. By supplying crafted cdc and rmd request attributes during certificate enrollment, an attacker forces the Enterprise CA to query an attacker-controlled host over SMB and LDAP. The CA blindly trusts the returned directory objects (objectSid and dNSHostName of a real DC) and issues a certificate with strong identity mapping for the Domain Controller, enabling successful PKINIT authentication as the DC. ## Content **Certighost (CVE-2026-54121) — AD CS Domain Controller Impersonation** **Low-privileged domain user can impersonate a Domain Controller via an AD CS enrollment chase fallback. By supplying cdc (Client DC) and rmd (Remote Domain) request attributes, an attacker forces the Enterprise CA to query an attacker-controlled host over SMB and LDAP.** **The CA then blindly trusts the returned directory objects (objectSid + dNSHostName of a real DC) and issues a certificate containing strong identity mapping for the Domain Controller. This allows successful PKINIT authentication as the DC.** **Research:** [https://gist.github.com/H0j3n/a5ef2609b5f2944ac2390a191a534c26](https://gist.github.com/H0j3n/a5ef2609b5f2944ac2390a191a534c26) **Source:** [https://github.com/aniqfakhrul/CVE-2026-54121](https://github.com/aniqfakhrul/CVE-2026-54121) ## Similar posts on daily.dev - [Certighost and the Privilege Hiding in Your Certificate Authority](https://daily.dev/posts/certighost-and-the-privilege-hiding-in-your-certificate-authority-8opcdovjc) · BleepingComputer · 0 upvotes · 0 comments - [New Certighost PoC exploit lets attackers hijack Windows domains](https://daily.dev/posts/new-certighost-poc-exploit-lets-attackers-hijack-windows-domains-jhtwvjxyo) · BleepingComputer · 0 upvotes · 0 comments - [Inside AD CS Escalation: Unpacking Advanced Misuse Techniques and Tools](https://daily.dev/posts/inside-ad-cs-escalation-unpacking-advanced-misuse-techniques-and-tools-qejabt669) · Unit 42 · 1 upvotes · 0 comments --- Tags: [#security](https://daily.dev/tags/security), [#active-directory](https://daily.dev/tags/active-directory) [View this post on daily.dev](https://daily.dev/posts/certighost-cve-2026-54121--axfow8dnw) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"DiscussionForumPosting","mainEntityOfPage":"https://daily.dev/posts/certighost-cve-2026-54121--axfow8dnw","headline":"Certighost (CVE-2026-54121)","text":"CVE-2026-54121 (Certighost) is a vulnerability in Active Directory Certificate Services (AD CS) that allows a low-privileged domain user to impersonate a Domain Controller. 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