CVE-2026-80098

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 73% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 10.0Exploit: None knownExposed: 0

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

Improper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a network.

CVSS v3
10.0
EG Score
10.0(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity100% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

September 3, 2026

Last Modified

September 18, 2026

Advisory Details (1)

Auto-updated Sep 18, 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-2026-80098

Vendor Advisories for CVE-2026-80098(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 104× in last 7d / 233× 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 233 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-80098?
CVE-2026-80098 is a critical vulnerability published on September 3, 2026. Improper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a network.
When was CVE-2026-80098 disclosed?
CVE-2026-80098 was first published in the National Vulnerability Database on September 3, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-80098 actively exploited?
CVE-2026-80098 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 73.1% of all scored CVEs.
What is the CVSS score of CVE-2026-80098?
CVE-2026-80098 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-80098?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-80098, 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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