CVE-2026-10080

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-08-18. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fails to validate WebSocket command field types which allows an authenticated user to crash the plugin process and deny service to all Boards users via a custom_focalboard_SUBSCRIBE_TEAM message with a non-string teamId.. Mattermost Advisory ID: MMSA-2026-00687

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

August 17, 2026

Last Modified

August 18, 2026

Advisory Details (1)

Auto-updated Aug 17, 2026
No patch confirmed yet.
generic

Security Updates

https://mattermost.com/security-updates

Vendor Advisories for CVE-2026-10080(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 16× in last 7d / 77× 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.

  1. 2026-09-18 21:54 UTCEG score recompute
  2. 2026-09-18 21:54 UTCGHSA enrichment
  3. 2026-09-18 19:27 UTCEPSS rescore
  4. 2026-09-17 21:53 UTCEG score recompute
  5. 2026-09-17 21:53 UTCGHSA enrichment
  6. 2026-09-16 23:01 UTCEG score recompute
  7. 2026-09-16 23:01 UTCGHSA enrichment
  8. 2026-09-16 05:14 UTCEPSS rescore
  9. 2026-09-15 19:11 UTCEG score recompute
  10. 2026-09-15 19:11 UTCGHSA enrichment
  11. 2026-09-14 19:49 UTCGHSA enrichment
  12. 2026-09-13 20:55 UTCEG score recompute
  13. 2026-09-13 20:55 UTCGHSA enrichment
  14. 2026-09-13 16:46 UTCEPSS rescore
  15. 2026-09-12 22:20 UTCEG score recompute
  16. 2026-09-12 22:20 UTCGHSA enrichment
  17. 2026-09-12 15:00 UTCEPSS rescore
  18. 2026-09-11 23:45 UTCEG score recompute
  19. 2026-09-11 23:45 UTCGHSA enrichment
  20. 2026-09-11 14:52 UTCEPSS rescore
  21. 2026-09-11 09:36 UTCEPSS rescore
  22. 2026-09-11 00:45 UTCEG score recompute
  23. 2026-09-11 00:45 UTCGHSA enrichment
  24. 2026-09-10 09:34 UTCEPSS rescore
  25. 2026-09-10 02:10 UTCGHSA enrichment
Show 66 more
  1. 2026-09-09 03:35 UTCEG score recompute
  2. 2026-09-09 03:35 UTCGHSA enrichment
  3. 2026-09-08 22:00 UTCEPSS rescore
  4. 2026-09-07 16:10 UTCEG score recompute
  5. 2026-09-07 16:10 UTCGHSA enrichment
  6. 2026-09-07 16:01 UTCEPSS rescore
  7. 2026-09-06 16:31 UTCEG score recompute
  8. 2026-09-06 16:31 UTCGHSA enrichment
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-05 17:56 UTCEG score recompute
  11. 2026-09-05 17:56 UTCGHSA enrichment
  12. 2026-09-04 19:16 UTCEG score recompute
  13. 2026-09-04 19:16 UTCGHSA enrichment
  14. 2026-09-04 05:06 UTCEPSS rescore
  15. 2026-09-03 20:41 UTCGHSA enrichment
  16. 2026-09-02 22:06 UTCEG score recompute
  17. 2026-09-02 22:05 UTCGHSA enrichment
  18. 2026-09-02 14:11 UTCEPSS rescore
  19. 2026-09-01 23:26 UTCEG score recompute
  20. 2026-09-01 23:26 UTCGHSA enrichment
  21. 2026-09-01 13:53 UTCEPSS rescore
  22. 2026-09-01 04:39 UTCEPSS rescore
  23. 2026-09-01 00:51 UTCGHSA enrichment
  24. 2026-08-31 02:16 UTCEG score recompute
  25. 2026-08-31 02:16 UTCGHSA enrichment
  26. 2026-08-30 19:17 UTCEPSS rescore
  27. 2026-08-30 03:41 UTCEG score recompute
  28. 2026-08-30 03:41 UTCGHSA enrichment
  29. 2026-08-30 01:21 UTCEPSS rescore
  30. 2026-08-29 05:06 UTCEG score recompute
  31. 2026-08-29 05:06 UTCGHSA enrichment
  32. 2026-08-28 21:40 UTCEPSS rescore
  33. 2026-08-28 02:46 UTCEG score recompute
  34. 2026-08-28 02:46 UTCGHSA enrichment
  35. 2026-08-27 14:24 UTCEPSS rescore
  36. 2026-08-27 04:11 UTCEG score recompute
  37. 2026-08-27 04:11 UTCGHSA enrichment
  38. 2026-08-26 05:35 UTCEG score recompute
  39. 2026-08-26 05:35 UTCGHSA enrichment
  40. 2026-08-25 13:48 UTCEPSS rescore
  41. 2026-08-25 07:00 UTCEG score recompute
  42. 2026-08-25 07:00 UTCGHSA enrichment
  43. 2026-08-24 08:24 UTCGHSA enrichment
  44. 2026-08-23 09:46 UTCEG score recompute
  45. 2026-08-23 09:46 UTCGHSA enrichment
  46. 2026-08-23 00:19 UTCEPSS rescore
  47. 2026-08-22 11:11 UTCEG score recompute
  48. 2026-08-22 11:11 UTCGHSA enrichment
  49. 2026-08-21 23:48 UTCEPSS rescore
  50. 2026-08-21 12:36 UTCEG score recompute
  51. 2026-08-21 12:36 UTCGHSA enrichment
  52. 2026-08-20 22:55 UTCEPSS rescore
  53. 2026-08-20 14:01 UTCEG score recompute
  54. 2026-08-20 14:01 UTCGHSA enrichment
  55. 2026-08-19 17:03 UTCEPSS rescore
  56. 2026-08-19 15:19 UTCGHSA enrichment
  57. 2026-08-18 16:43 UTCEG score recompute
  58. 2026-08-18 16:43 UTCGHSA enrichment
  59. 2026-08-18 15:33 UTCEG score recompute
  60. 2026-08-18 15:32 UTCGHSA enrichment
  61. 2026-08-18 15:23 UTCEG score recompute
  62. 2026-08-18 15:23 UTCGHSA enrichment
  63. 2026-08-18 13:48 UTCEPSS rescore
  64. 2026-08-17 22:21 UTCEG score recompute
  65. 2026-08-17 22:09 UTCEG score recompute
  66. 2026-08-17 22:08 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-10080?
CVE-2026-10080 is a medium vulnerability published on August 17, 2026. Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fails to validate WebSocket command field types which allows an authenticated user to crash the plugin process and deny service to all Boards users via a customfocalboardSUBSCRIBE_TEAM message with a non-string teamId..…
When was CVE-2026-10080 disclosed?
CVE-2026-10080 was first published in the National Vulnerability Database on August 17, 2026, with the most recent update on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-10080 actively exploited?
CVE-2026-10080 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 77.5% of all scored CVEs.
What is the CVSS score of CVE-2026-10080?
CVE-2026-10080 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-10080?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-10080, 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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