CVE-2026-85880

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 2026-09-08), 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
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 1%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.

Heap-based buffer overflow in Windows ALPC 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
1%
EPSS %ILE
46%
KEV
⚠ Exploited

Published

September 8, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Sep 8, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa, microsoft.
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-2026-85880
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-2026-85880

Vendor Advisories for CVE-2026-85880(2)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 112× in last 7d / 183× 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 183 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2026-85880?
CVE-2026-85880 is a critical vulnerability published on September 8, 2026. Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.
When was CVE-2026-85880 disclosed?
CVE-2026-85880 was first published in the National Vulnerability Database on September 8, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-85880 actively exploited?
Yes. CISA added CVE-2026-85880 to the Known Exploited Vulnerabilities catalog on September 8, 2026, affecting Microsoft Windows. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-85880?
CVE-2026-85880 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-2026-85880?
CVE-2026-85880 affects Microsoft Windows. 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-2026-85880?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-85880, 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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