CVE-2026-64904

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-11. 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.

Access of resource using incompatible type ('type confusion') in Microsoft Office 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
23%
KEV
Not listed

Published

August 11, 2026

Last Modified

August 20, 2026

Advisory Details (1)

Auto-updated Aug 11, 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-2026-64904

Vendor Advisories for CVE-2026-64904(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 84× in last 7d / 127× 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 127 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-64904?
CVE-2026-64904 is a high vulnerability published on August 11, 2026. Access of resource using incompatible type ('type confusion') in Microsoft Office allows an unauthorized attacker to execute code locally.
When was CVE-2026-64904 disclosed?
CVE-2026-64904 was first published in the National Vulnerability Database on August 11, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64904 actively exploited?
CVE-2026-64904 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 77.0% of all scored CVEs.
What is the CVSS score of CVE-2026-64904?
CVE-2026-64904 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-64904?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64904, 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-2026-64904

Explore →

Is Your Infrastructure Affected by CVE-2026-64904?

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

Start Free Scan →Browse All CVEs