CVE-2026-54121

HIGHPre-NVD 8.88.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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: the CNA's CVSS, EPSS, GitHub Security Advisory
Trending — 4 sources updated this weekElevated
8.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 8.8Exploit: Public PoCExposed services: Not assessed

A fix is available — apply it.

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
8.8HIGHmedium confidence
EG Risk
56
EG Risk 56/100

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 (value × EchelonGraph’s weight)
Severity88% × 45%
The EG Score, 8.8 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.8%
EPSS %ILE
54th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 14, 2026

Last Modified

October 8, 2026

Advisory Details (1)

Auto-updated Jul 14, 2026
Patch available. Sources: microsoft.
MicrosoftMentions a patch (unverified)

Security Update Guide - Microsoft Security Response Center

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 / 51× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 350 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 250 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  3. 2026-10-12 15:56 UTCEG score recompute
  4. 2026-10-11 19:40 UTCEG score recompute
  5. 2026-10-11 16:55 UTCEG score recompute
  6. 2026-10-11 14:18 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  10. 2026-10-08 19:22 UTCEG score recompute
  11. 2026-10-08 19:22 UTCVendor advisory
  12. 2026-10-08 19:22 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  13. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  15. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  17. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  18. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  19. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  20. 2026-10-01 12:59 UTCEG score recompute
  21. 2026-10-01 12:59 UTCVendor advisory
  22. 2026-10-01 12:59 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  23. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  24. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  25. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.8% · 54th percentile
Show 75 more
  1. 2026-09-28 09:06 UTCEG score recompute
  2. 2026-09-28 09:06 UTCVendor advisory
  3. 2026-09-28 09:06 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  4. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  5. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  6. 2026-09-25 18:46 UTCEG score recompute
  7. 2026-09-25 18:46 UTCVendor advisory
  8. 2026-09-25 18:46 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  9. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  10. 2026-09-24 09:08 UTCEG score recompute
  11. 2026-09-24 09:08 UTCVendor advisory
  12. 2026-09-24 09:08 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  13. 2026-09-23 17:54 UTCEPSS rescoreEPSS 1.8% · 77th percentile
  14. 2026-09-23 03:41 UTCEG score recompute
  15. 2026-09-23 03:41 UTCVendor advisory
  16. 2026-09-23 03:41 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  17. 2026-09-20 20:16 UTCEPSS rescoreEPSS 1.8% · 77th percentile
  18. 2026-09-18 19:28 UTCEPSS rescoreEPSS 1.8% · 77th percentile
  19. 2026-09-18 10:06 UTCVendor advisory
  20. 2026-09-18 10:06 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  21. 2026-09-17 23:02 UTCEG score recompute
  22. 2026-09-17 23:02 UTCVendor advisory
  23. 2026-09-17 23:02 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  24. 2026-09-17 19:31 UTCEPSS rescoreEPSS 1.8% · 77th percentile
  25. 2026-09-16 14:08 UTCEPSS rescoreEPSS 1.8% · 77th percentile
  26. 2026-09-16 05:15 UTCEPSS rescoreEPSS 1.8% · 77th percentile
  27. 2026-09-14 10:24 UTCVendor advisory
  28. 2026-09-14 10:24 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  29. 2026-09-13 23:20 UTCEG score recompute
  30. 2026-09-13 23:20 UTCVendor advisory
  31. 2026-09-13 23:20 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  32. 2026-09-13 16:47 UTCEPSS rescoreEPSS 1.8% · 77th percentile
  33. 2026-09-13 07:45 UTCEG score recompute
  34. 2026-09-13 07:45 UTCVendor advisory
  35. 2026-09-13 07:45 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  36. 2026-09-12 13:14 UTCVendor advisory
  37. 2026-09-12 13:14 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  38. 2026-09-12 01:24 UTCEG score recompute
  39. 2026-09-12 01:24 UTCVendor advisory
  40. 2026-09-12 01:24 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  41. 2026-09-11 14:53 UTCEPSS rescoreEPSS 1.8% · 77th percentile
  42. 2026-09-10 09:35 UTCEPSS rescoreEPSS 1.8% · 77th percentile
  43. 2026-09-09 22:45 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  44. 2026-09-08 22:43 UTCEG score recompute
  45. 2026-09-08 22:43 UTCVendor advisory
  46. 2026-09-08 22:43 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  47. 2026-09-08 22:01 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  48. 2026-09-08 21:29 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  49. 2026-09-08 20:27 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  50. 2026-09-08 01:23 UTCEG score recompute
  51. 2026-09-08 01:23 UTCVendor advisory
  52. 2026-09-08 01:23 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  53. 2026-09-07 16:01 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  54. 2026-09-06 13:47 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  55. 2026-09-06 13:39 UTCVendor advisory
  56. 2026-09-06 13:39 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  57. 2026-09-05 21:07 UTCEG score recompute
  58. 2026-09-05 21:07 UTCVendor advisory
  59. 2026-09-05 21:06 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  60. 2026-09-04 22:52 UTCEG score recompute
  61. 2026-09-04 22:52 UTCVendor advisory
  62. 2026-09-04 22:52 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  63. 2026-09-04 05:06 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  64. 2026-09-02 19:45 UTCEG score recompute
  65. 2026-09-02 19:45 UTCVendor advisory
  66. 2026-09-02 19:45 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  67. 2026-09-02 14:12 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  68. 2026-09-01 13:54 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  69. 2026-09-01 04:40 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  70. 2026-08-31 15:56 UTCVendor advisory
  71. 2026-08-31 15:56 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  72. 2026-08-31 04:58 UTCEG score recompute
  73. 2026-08-31 04:58 UTCVendor advisory
  74. 2026-08-31 04:58 UTCGHSA enrichmentGHSA-64qv-2ffq-h4w6 · GitHub severity HIGH · GitHub CVSS 8.8
  75. 2026-08-30 19:17 UTCEPSS rescoreEPSS 1.8% · 76th percentile

Publicly available exploits

(7 references)

Public exploit code is referenced for this CVE (7 GitHub PoCs). Defenders should treat patch urgency accordingly.

  • GitHub PoCZeroDayEvil/CVE-2026-54121
    Published Sep 28, 2026
    Open source ↗
  • GitHub PoCZeroDayEvil/CVE-2026-54121-Certighost
    Published 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
    Published 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
    Published Jul 27, 2026

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

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

    CVE-2026-54121

    Open source ↗
  • GitHub PoCtc4dy/CVE-2026-54121-PoC-Exploit
    Published 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 PoCaniqfakhrul/CVE-2026-54121
    Published 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-severity vulnerability; its CVE record was 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 made public?
CVE-2026-54121 was made public on July 14, 2026: that is the date its CVE record's CNA, Microsoft Corporation, gives for when the vulnerability was made public. The CVE record itself was published on July 14, 2026. EchelonGraph's copy of the record carries a last-modified date of October 8, 2026; the record at its source may have been updated since.
Is CVE-2026-54121 actively exploited?
CVE-2026-54121 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (54th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54121?
CVE-2026-54121 has a CVSS base score of 8.8 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-54121?
A fix for CVE-2026-54121 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54121 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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