CVE-2026-54130

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-19. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
63%
KEV
Not listed

Published

June 18, 2026

Last Modified

August 25, 2026

Advisory Details (1)

Auto-updated Sep 9, 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-2026-54130

Vendor Advisories for CVE-2026-54130(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 5× in last 7d / 144× 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 712 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-54130?
CVE-2026-54130 is a critical vulnerability published on June 18, 2026. Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.
When was CVE-2026-54130 disclosed?
CVE-2026-54130 was first published in the National Vulnerability Database on June 18, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54130 actively exploited?
CVE-2026-54130 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 36.7% of all scored CVEs.
What is the CVSS score of CVE-2026-54130?
CVE-2026-54130 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-54130?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54130, 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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