CVE-2026-59118

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

Score 9.3 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-07. The CNA's CVSS baseline 9.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 9.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Improper authorization in Copilot Cowork allows an unauthorized attacker to elevate privileges over a network.

CVSS v3
9.3
EG Score
9.3CRITICALmedium confidence
EG Risk
42
EG Risk 42/100CISA 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
Severity93% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.7%
EPSS %ILE
52nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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 6, 2026

Last Modified

September 29, 2026

Advisory Details (1)

Auto-updated Oct 3, 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-2026-59118

Vendor Advisories for CVE-2026-59118(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 47× in last 7d / 271× 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 715 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-59118?
CVE-2026-59118 is a critical vulnerability published on August 6, 2026. Improper authorization in Copilot Cowork allows an unauthorized attacker to elevate privileges over a network.
When was CVE-2026-59118 disclosed?
CVE-2026-59118 was first published on August 6, 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-2026-59118 actively exploited?
CVE-2026-59118 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (52nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-59118?
CVE-2026-59118 has a CVSS base score of 9.3 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-59118?
A fix for CVE-2026-59118 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-59118 are linked in the Vendor Advisories panel on this page.

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