CVE-2026-81388

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-08. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

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

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

CVSS v3
7.8
EG Score
7.8(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 24, 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-2026-81388

Vendor Advisories for CVE-2026-81388(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 50× in last 7d / 142× 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 142 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-81388?
CVE-2026-81388 is a high vulnerability published on September 8, 2026. Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
When was CVE-2026-81388 disclosed?
CVE-2026-81388 was first published in the National Vulnerability Database on September 8, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-81388 actively exploited?
CVE-2026-81388 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 62.3% of all scored CVEs.
What is the CVSS score of CVE-2026-81388?
CVE-2026-81388 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-81388?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-81388, 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

Explore the affected products and dependency analysis for CVE-2026-81388

Explore →

Is Your Infrastructure Affected by CVE-2026-81388?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs