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: 0.4%CVSS: 5.5Exploit: None knownExposed services: Not assessed

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
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100CISA SSVC

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%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
35th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 11, 2026

Last Modified

September 29, 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 / EcosystemFix (by version range) / 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 20× in last 7d / 105× 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 284 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 on August 11, 2026, with the most recent update on September 29, 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 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-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?
A fix for CVE-2026-66806 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-66806 are linked in the Vendor Advisories panel on this page.

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