CVE-2026-54121

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-14. the CNA's CVSS baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this weekElevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 8.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Improper authorization in Active Directory Certificate Services (AD CS) allows an authorized attacker to elevate privileges over a network.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
56(Track)
EG Risk 56/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
77%
KEV
Not listed

Published

July 14, 2026

Last Modified

September 17, 2026

Advisory Details (1)

Auto-updated Jul 14, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54121

Vendor Advisories for CVE-2026-54121(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 105× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 308 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 10:06 UTCVendor advisory
  3. 2026-09-18 10:06 UTCGHSA enrichment
  4. 2026-09-17 23:02 UTCEG score recompute
  5. 2026-09-17 23:02 UTCVendor advisory
  6. 2026-09-17 23:02 UTCGHSA enrichment
  7. 2026-09-17 19:31 UTCEPSS rescore
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 05:15 UTCEPSS rescore
  10. 2026-09-14 10:24 UTCVendor advisory
  11. 2026-09-14 10:24 UTCGHSA enrichment
  12. 2026-09-13 23:20 UTCEG score recompute
  13. 2026-09-13 23:20 UTCVendor advisory
  14. 2026-09-13 23:20 UTCGHSA enrichment
  15. 2026-09-13 16:47 UTCEPSS rescore
  16. 2026-09-13 07:45 UTCEG score recompute
  17. 2026-09-13 07:45 UTCVendor advisory
  18. 2026-09-13 07:45 UTCGHSA enrichment
  19. 2026-09-12 13:14 UTCVendor advisory
  20. 2026-09-12 13:14 UTCGHSA enrichment
  21. 2026-09-12 01:24 UTCEG score recompute
  22. 2026-09-12 01:24 UTCVendor advisory
  23. 2026-09-12 01:24 UTCGHSA enrichment
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-10 09:35 UTCEPSS rescore
Show 75 more
  1. 2026-09-09 22:45 UTCGHSA enrichment
  2. 2026-09-08 22:43 UTCEG score recompute
  3. 2026-09-08 22:43 UTCVendor advisory
  4. 2026-09-08 22:43 UTCGHSA enrichment
  5. 2026-09-08 22:01 UTCEPSS rescore
  6. 2026-09-08 21:29 UTCGHSA enrichment
  7. 2026-09-08 20:27 UTCGHSA enrichment
  8. 2026-09-08 01:23 UTCEG score recompute
  9. 2026-09-08 01:23 UTCVendor advisory
  10. 2026-09-08 01:23 UTCGHSA enrichment
  11. 2026-09-07 16:01 UTCEPSS rescore
  12. 2026-09-06 13:47 UTCEPSS rescore
  13. 2026-09-06 13:39 UTCVendor advisory
  14. 2026-09-06 13:39 UTCGHSA enrichment
  15. 2026-09-05 21:07 UTCEG score recompute
  16. 2026-09-05 21:07 UTCVendor advisory
  17. 2026-09-05 21:06 UTCGHSA enrichment
  18. 2026-09-04 22:52 UTCEG score recompute
  19. 2026-09-04 22:52 UTCVendor advisory
  20. 2026-09-04 22:52 UTCGHSA enrichment
  21. 2026-09-04 05:06 UTCEPSS rescore
  22. 2026-09-02 19:45 UTCEG score recompute
  23. 2026-09-02 19:45 UTCVendor advisory
  24. 2026-09-02 19:45 UTCGHSA enrichment
  25. 2026-09-02 14:12 UTCEPSS rescore
  26. 2026-09-01 13:54 UTCEPSS rescore
  27. 2026-09-01 04:40 UTCEPSS rescore
  28. 2026-08-31 15:56 UTCVendor advisory
  29. 2026-08-31 15:56 UTCGHSA enrichment
  30. 2026-08-31 04:58 UTCEG score recompute
  31. 2026-08-31 04:58 UTCVendor advisory
  32. 2026-08-31 04:58 UTCGHSA enrichment
  33. 2026-08-30 19:17 UTCEPSS rescore
  34. 2026-08-30 16:13 UTCVendor advisory
  35. 2026-08-30 16:13 UTCGHSA enrichment
  36. 2026-08-30 04:43 UTCEG score recompute
  37. 2026-08-30 04:43 UTCVendor advisory
  38. 2026-08-30 04:43 UTCGHSA enrichment
  39. 2026-08-30 01:22 UTCEPSS rescore
  40. 2026-08-28 22:54 UTCEG score recompute
  41. 2026-08-28 22:54 UTCVendor advisory
  42. 2026-08-28 22:53 UTCGHSA enrichment
  43. 2026-08-28 21:41 UTCEPSS rescore
  44. 2026-08-28 01:55 UTCEG score recompute
  45. 2026-08-28 01:55 UTCVendor advisory
  46. 2026-08-28 01:55 UTCGHSA enrichment
  47. 2026-08-27 14:25 UTCEPSS rescore
  48. 2026-08-27 13:19 UTCGHSA enrichment
  49. 2026-08-26 23:53 UTCEG score recompute
  50. 2026-08-26 23:53 UTCVendor advisory
  51. 2026-08-26 23:53 UTCGHSA enrichment
  52. 2026-08-26 14:46 UTCEPSS rescore
  53. 2026-08-26 12:48 UTCVendor advisory
  54. 2026-08-26 12:48 UTCGHSA enrichment
  55. 2026-08-26 01:21 UTCEG score recompute
  56. 2026-08-26 01:21 UTCVendor advisory
  57. 2026-08-26 01:21 UTCGHSA enrichment
  58. 2026-08-25 13:49 UTCEPSS rescore
  59. 2026-08-25 08:57 UTCVendor advisory
  60. 2026-08-25 08:57 UTCGHSA enrichment
  61. 2026-08-24 21:09 UTCEG score recompute
  62. 2026-08-24 21:09 UTCVendor advisory
  63. 2026-08-24 21:09 UTCGHSA enrichment
  64. 2026-08-24 10:08 UTCEG score recompute
  65. 2026-08-24 10:08 UTCVendor advisory
  66. 2026-08-24 10:08 UTCGHSA enrichment
  67. 2026-08-23 23:04 UTCVendor advisory
  68. 2026-08-23 23:04 UTCGHSA enrichment
  69. 2026-08-23 11:46 UTCVendor advisory
  70. 2026-08-23 11:46 UTCGHSA enrichment
  71. 2026-08-23 00:42 UTCEG score recompute
  72. 2026-08-23 00:42 UTCVendor advisory
  73. 2026-08-23 00:42 UTCGHSA enrichment
  74. 2026-08-23 00:19 UTCEPSS rescore
  75. 2026-08-22 13:38 UTCVendor advisory

Publicly available exploits

(6 references)

Working exploit code is in the public domain (6 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCZeroDayEvil/CVE-2026-54121-Certighost
    First seen Sep 11, 2026

    🛡️ Official AI Security Tool module for CVE-2026-54121 (Certighost - AD CS Domain Controller Impersonation & PKINIT Elevation).

    Open source ↗
  • GitHub PoCnafiez/Metasploit-CVE-2026-54121-Certighost
    First seen Jul 31, 2026

    A Metasploit auxiliary module that escalates from any low-privileged domain user to full domain compromise by abusing the AD CS enrollment "chase" fallback. The CA can be coerced into authenticating back to attacker-controlled infrastructure and then issuing a certificate that impersonates a Domain Controller.

    Open source ↗
  • GitHub PoCmarcgoam/CVE-2026-54121-CertiGhost
    First seen Jul 27, 2026

    CVE-2026-54121 (Certighost) AD CS DC-impersonation PoC. Patched SAN handling + MAQ-safe account reuse.

    Open source ↗
  • GitHub PoCtc4dy/CVE-2026-54121-PoC-Exploit
    First seen Jul 25, 2026

    👻 CVE-2026-54121 - Best CertiGhost AD CS Multi-Exploit Framework ⚡Weaponized tool with rogue DC/LDAP servers, certificate abuse, PKINIT hash extraction. Features: detect safe check, exploit full multi-threaded. 🛡️ CVSS 8.8 High - Use Ethically, Stay Legal. 🔒

    Open source ↗
  • GitHub PoC0xBlackash/CVE-2026-54121
    First seen Jul 25, 2026

    CVE-2026-54121

    Open source ↗
  • GitHub PoCaniqfakhrul/CVE-2026-54121
    First seen Jul 23, 2026

    Certighost POC

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54121?
CVE-2026-54121 is a high vulnerability published on July 14, 2026. Improper authorization in Active Directory Certificate Services (AD CS) allows an authorized attacker to elevate privileges over a network.
When was CVE-2026-54121 disclosed?
CVE-2026-54121 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54121 actively exploited?
CVE-2026-54121 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 22.7% of all scored CVEs.
What is the CVSS score of CVE-2026-54121?
CVE-2026-54121 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-54121?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54121, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-54121

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