CVE-2026-56155

HIGHPre-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 — KEV-added this weekExploited in the wild
7.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 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)
EPSS
30.1%
KEV
⚠ Exploited

Published

July 14, 2026

Last Modified

July 15, 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(1)

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.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 26× in last 7d / 26× 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.

  1. 2026-07-15 22:51 UTCEG score recompute
  2. 2026-07-15 22:51 UTCVendor advisory
  3. 2026-07-15 22:51 UTCGHSA enrichment
  4. 2026-07-15 19:12 UTCEG score recompute
  5. 2026-07-15 19:12 UTCVendor advisory
  6. 2026-07-15 19:12 UTCGHSA enrichment
  7. 2026-07-15 16:57 UTCEPSS rescore
  8. 2026-07-15 16:57 UTCEPSS rescore
  9. 2026-07-15 16:49 UTCCISA KEV update
  10. 2026-07-15 15:32 UTCEG score recompute
  11. 2026-07-15 15:32 UTCVendor advisory
  12. 2026-07-15 15:32 UTCGHSA enrichment
  13. 2026-07-15 15:04 UTCCISA KEV update
  14. 2026-07-15 11:53 UTCEG score recompute
  15. 2026-07-15 11:53 UTCVendor advisory
  16. 2026-07-15 11:53 UTCGHSA enrichment
  17. 2026-07-15 08:14 UTCEG score recompute
  18. 2026-07-15 08:14 UTCVendor advisory
  19. 2026-07-15 08:14 UTCGHSA enrichment
  20. 2026-07-15 04:34 UTCEG score recompute▲ 1.20
  21. 2026-07-15 04:34 UTCVendor advisory
  22. 2026-07-15 04:33 UTCGHSA enrichment
  23. 2026-07-14 18:05 UTCCISA KEV update
  24. 2026-07-14 17:13 UTCEG score recompute
  25. 2026-07-14 17:13 UTCVendor advisory
Show 1 more
  1. 2026-07-14 17:10 UTCMITRE cvelistV5first tracked

Frequently asked(6)

What is CVE-2026-56155?
CVE-2026-56155 is a high 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 July 15, 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.

Dependency Blast Radius

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