CVE-2026-6739

HIGHNVD 7.26.7▼
EchelonGraph scoreHIGH confidence

Score 6.7 from GitHub Security Advisory published 2026-06-12. NVD baseline CVSS 7.2; sources differ by 0.5.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.2
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.2Exploit: NoneExposed: 0

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

Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to require system-level permission when patching protected default system roles, which allows authenticated users with delegated user-management permissions to escalate privileges by altering built-in role permissions via the role patch API.. Mattermost Advisory ID: MMSA-2026-00656

CVSS v3
7.2
EG Score
6.7(high)
EPSS
17.1%
KEV
Not listed

Published

June 12, 2026

Last Modified

June 18, 2026

Advisory Details (1)

Auto-updated Jun 12, 2026
No patch confirmed yet.
generic

Security Updates

https://mattermost.com/security-updates

Vendor Advisories for CVE-2026-6739(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 24× 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.

  1. 2026-07-07 01:07 UTCEG score recompute
  2. 2026-07-07 01:07 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 19:49 UTCEG score recompute
  8. 2026-07-05 19:49 UTCGHSA enrichment
  9. 2026-07-05 02:31 UTCEPSS rescore
  10. 2026-07-05 02:30 UTCEPSS rescore
  11. 2026-07-04 19:11 UTCEG score recompute
  12. 2026-07-04 19:11 UTCGHSA enrichment
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-03 16:52 UTCEG score recompute
  16. 2026-07-03 16:51 UTCGHSA enrichment
  17. 2026-07-02 16:14 UTCEG score recompute
  18. 2026-07-02 16:14 UTCGHSA enrichment
  19. 2026-07-01 15:35 UTCEG score recompute
  20. 2026-07-01 15:35 UTCGHSA enrichment
  21. 2026-07-01 15:07 UTCEPSS rescore
  22. 2026-06-30 23:22 UTCEPSS rescore
  23. 2026-06-30 14:57 UTCEG score recompute
  24. 2026-06-30 14:57 UTCGHSA enrichment
  25. 2026-06-29 14:06 UTCEPSS rescore
Show 58 more
  1. 2026-06-29 14:00 UTCEG score recompute
  2. 2026-06-29 14:00 UTCGHSA enrichment
  3. 2026-06-28 14:07 UTCEPSS rescore
  4. 2026-06-28 13:22 UTCEG score recompute
  5. 2026-06-28 13:22 UTCGHSA enrichment
  6. 2026-06-28 04:56 UTCEPSS rescore
  7. 2026-06-27 12:44 UTCEG score recompute
  8. 2026-06-27 12:44 UTCGHSA enrichment
  9. 2026-06-27 03:08 UTCEPSS rescore
  10. 2026-06-26 12:05 UTCEG score recompute
  11. 2026-06-26 12:05 UTCGHSA enrichment
  12. 2026-06-25 13:50 UTCEPSS rescore
  13. 2026-06-25 07:27 UTCEG score recompute
  14. 2026-06-25 07:27 UTCGHSA enrichment
  15. 2026-06-24 14:05 UTCEPSS rescore
  16. 2026-06-24 06:49 UTCEG score recompute
  17. 2026-06-24 06:49 UTCGHSA enrichment
  18. 2026-06-23 21:33 UTCEPSS rescore
  19. 2026-06-23 21:33 UTCEPSS rescore
  20. 2026-06-23 04:28 UTCEG score recompute
  21. 2026-06-23 04:28 UTCGHSA enrichment
  22. 2026-06-22 14:25 UTCEPSS rescore
  23. 2026-06-22 14:25 UTCEPSS rescore
  24. 2026-06-22 03:50 UTCEG score recompute
  25. 2026-06-22 03:50 UTCGHSA enrichment
  26. 2026-06-21 14:56 UTCEPSS rescore
  27. 2026-06-21 14:56 UTCEPSS rescore
  28. 2026-06-21 01:59 UTCEPSS rescore
  29. 2026-06-21 01:59 UTCEPSS rescore
  30. 2026-06-20 23:48 UTCEG score recompute
  31. 2026-06-20 23:48 UTCGHSA enrichment
  32. 2026-06-19 22:45 UTCEG score recompute
  33. 2026-06-19 22:44 UTCGHSA enrichment
  34. 2026-06-19 19:26 UTCEPSS rescore
  35. 2026-06-19 19:26 UTCEPSS rescore
  36. 2026-06-18 22:06 UTCEG score recompute
  37. 2026-06-18 22:06 UTCGHSA enrichment
  38. 2026-06-18 17:52 UTCEPSS rescore
  39. 2026-06-18 17:52 UTCEPSS rescore
  40. 2026-06-18 15:52 UTCNVD updateCVSS v3 → 7.2 · severity → HIGH
  41. 2026-06-17 21:27 UTCEG score recompute
  42. 2026-06-17 21:27 UTCGHSA enrichment
  43. 2026-06-17 17:53 UTCEPSS rescore
  44. 2026-06-16 20:49 UTCEG score recompute
  45. 2026-06-16 20:49 UTCGHSA enrichment
  46. 2026-06-16 17:53 UTCEPSS rescore
  47. 2026-06-15 20:10 UTCEG score recompute
  48. 2026-06-15 20:09 UTCGHSA enrichment
  49. 2026-06-15 17:49 UTCEPSS rescore
  50. 2026-06-15 17:49 UTCEPSS rescore
  51. 2026-06-14 23:18 UTCEPSS rescore
  52. 2026-06-14 19:30 UTCEG score recompute
  53. 2026-06-14 19:30 UTCGHSA enrichment
  54. 2026-06-13 23:00 UTCEPSS rescore
  55. 2026-06-13 18:53 UTCEG score recompute
  56. 2026-06-13 18:53 UTCGHSA enrichment
  57. 2026-06-12 18:14 UTCEG score recompute
  58. 2026-06-12 18:13 UTCNVD updatefirst tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-6739?
CVE-2026-6739 is a high vulnerability published on June 12, 2026. Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to require system-level permission when patching protected default system roles, which allows authenticated users with delegated user-management permissions to escalate privileges by altering…
When was CVE-2026-6739 disclosed?
CVE-2026-6739 was first published in the National Vulnerability Database on June 12, 2026, with the most recent update on June 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6739 actively exploited?
CVE-2026-6739 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-6739?
CVE-2026-6739 has a CVSS v3 base score of 7.2 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.7.
How do I remediate CVE-2026-6739?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6739, 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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