CVE-2026-56155

CRITICALPre-NVD 7.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-07-14), indicating real-world exploitation has been confirmed by US federal agencies. the CNA's CVSS baseline 7.8 retained for reference (NVD's own analysis pending). Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, cna:microsoft, epss, ghsa
Trending — 5 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 0%CVSS: 7.8Exploit: cisa kev · ssvc activeExposed: 0

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

Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.

CVSS v3
7.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
28%
KEV
⚠ Exploited

Published

July 14, 2026

Last Modified

September 17, 2026

Advisory Details (2)

Auto-updated Jul 14, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: microsoft, cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56155
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-2026-56155

Vendor Advisories for CVE-2026-56155(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 111× in last 7d / 455× 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 5,934 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2026-56155?
CVE-2026-56155 is a critical vulnerability published on July 14, 2026. Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.
When was CVE-2026-56155 disclosed?
CVE-2026-56155 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-2026-56155 actively exploited?
Yes. CISA added CVE-2026-56155 to the Known Exploited Vulnerabilities catalog on July 14, 2026, affecting Microsoft Active Directory Federation Services. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-56155?
CVE-2026-56155 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2026-56155?
CVE-2026-56155 affects Microsoft Active Directory Federation Services. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-56155?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56155, 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.

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