CVE-2026-81389

HIGHPre-NVD 7.07.0—
EchelonGraph scoreHIGH confidence

Score 7.0 from GitHub Security Advisory (severity: HIGH) published 2026-09-08. the CNA's CVSS baseline 7.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
7.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.0Exploit: None knownExposed: 0

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

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

CVSS v3
7.0
EG Score
7.0(high)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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
Severity70% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 18, 2026

Advisory Details (1)

Auto-updated Sep 8, 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-2026-81389

Vendor Advisories for CVE-2026-81389(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 55× in last 7d / 111× 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 111 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-81389?
CVE-2026-81389 is a high vulnerability published on September 8, 2026. Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
When was CVE-2026-81389 disclosed?
CVE-2026-81389 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-2026-81389 actively exploited?
CVE-2026-81389 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 70.7% of all scored CVEs.
What is the CVSS score of CVE-2026-81389?
CVE-2026-81389 has a CVSS v4.0 base score of 7.0 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-81389?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-81389, 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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