CVE-2026-26164

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-08. the CNA's CVSS baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

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

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
54%
KEV
Not listed

Published

May 7, 2026

Last Modified

August 10, 2026

Advisory Details (1)

Auto-updated May 7, 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-2026-26164

Vendor Advisories for CVE-2026-26164(1)

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 6× in last 7d / 83× 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 268 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-26164?
CVE-2026-26164 is a high vulnerability published on May 7, 2026. Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.
When was CVE-2026-26164 disclosed?
CVE-2026-26164 was first published in the National Vulnerability Database on May 7, 2026, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-26164 actively exploited?
CVE-2026-26164 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 46.0% of all scored CVEs.
What is the CVSS score of CVE-2026-26164?
CVE-2026-26164 has a CVSS v4.0 base score of 7.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-26164?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-26164, 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

Explore the affected products and dependency analysis for CVE-2026-26164

Explore →

Is Your Infrastructure Affected by CVE-2026-26164?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs