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%CVSS: 9.3Exploit: None knownExposed: 0

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

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

CVSS v3
9.3
EG Score
9.3(medium)
EG Risk
42(Track)
EG Risk 42/100SSVC: 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
Severity93% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
41%
KEV
Not listed

Published

August 6, 2026

Last Modified

September 16, 2026

Advisory Details (1)

Auto-updated Sep 17, 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 77× in last 7d / 351× 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 608 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 in the National Vulnerability Database on August 6, 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-2026-59118 actively exploited?
CVE-2026-59118 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 59.4% of all scored CVEs.
What is the CVSS score of CVE-2026-59118?
CVE-2026-59118 has a CVSS v4.0 base score of 9.3 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-59118?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59118, 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

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