CVE-2026-66806

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-08-11. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

Off-by-one error in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

August 11, 2026

Last Modified

September 16, 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-2026-66806

Vendor Advisories for CVE-2026-66806(4)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhacm2/console-rhel9:17876870622026-08-26redhat
redhatmulticluster-engine/console-mce-rhel9:17872642502026-08-25redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 132× 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 234 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-66806?
CVE-2026-66806 is a medium vulnerability published on August 11, 2026. Off-by-one error in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
When was CVE-2026-66806 disclosed?
CVE-2026-66806 was first published in the National Vulnerability Database on August 11, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66806 actively exploited?
CVE-2026-66806 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 76.3% of all scored CVEs.
What is the CVSS score of CVE-2026-66806?
CVE-2026-66806 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-66806?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66806, 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-2026-66806

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