CVE-2026-6739

HIGHNVD 7.27.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.2 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 83% 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 — 3 sources updated this week
7.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.2Exploit: None knownExposed: 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
7.2(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity72% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
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 20× in last 7d / 70× 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 115 total refreshes for this CVE.

  1. 2026-07-31 00:31 UTCEG score recompute
  2. 2026-07-31 00:31 UTCGHSA enrichment
  3. 2026-07-30 16:28 UTCEPSS rescore
  4. 2026-07-30 06:12 UTCEG score recompute
  5. 2026-07-30 06:12 UTCGHSA enrichment
  6. 2026-07-30 01:30 UTCEPSS rescore
  7. 2026-07-29 16:43 UTCGHSA enrichment
  8. 2026-07-29 04:19 UTCEG score recompute
  9. 2026-07-29 04:19 UTCGHSA enrichment
  10. 2026-07-28 15:37 UTCEPSS rescore
  11. 2026-07-28 02:06 UTCEG score recompute
  12. 2026-07-28 02:06 UTCGHSA enrichment
  13. 2026-07-27 14:14 UTCEPSS rescore
  14. 2026-07-27 09:00 UTCGHSA enrichment
  15. 2026-07-26 20:36 UTCEG score recompute
  16. 2026-07-26 20:36 UTCGHSA enrichment
  17. 2026-07-26 14:54 UTCEPSS rescore
  18. 2026-07-25 14:18 UTCEPSS rescore
  19. 2026-07-24 14:18 UTCEPSS rescore
  20. 2026-07-24 14:18 UTCEPSS rescore
  21. 2026-07-23 14:18 UTCEPSS rescore
  22. 2026-07-23 14:18 UTCEPSS rescore
  23. 2026-07-23 03:22 UTCEG score recompute▲ 0.50
  24. 2026-07-22 14:08 UTCEPSS rescore
  25. 2026-07-22 14:08 UTCEPSS rescore
Show 75 more
  1. 2026-07-21 15:25 UTCEPSS rescore
  2. 2026-07-21 15:25 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
  4. 2026-07-19 14:31 UTCEPSS rescore
  5. 2026-07-19 02:29 UTCEPSS rescore
  6. 2026-07-18 10:04 UTCEPSS rescore
  7. 2026-07-16 23:16 UTCGHSA enrichment
  8. 2026-07-16 17:03 UTCEPSS rescore
  9. 2026-07-15 16:57 UTCEPSS rescore
  10. 2026-07-15 16:19 UTCGHSA enrichment
  11. 2026-07-15 02:00 UTCEPSS rescore
  12. 2026-07-14 12:10 UTCGHSA enrichment
  13. 2026-07-13 22:31 UTCEPSS rescore
  14. 2026-07-13 11:31 UTCGHSA enrichment
  15. 2026-07-13 06:13 UTCEPSS rescore
  16. 2026-07-13 06:13 UTCEPSS rescore
  17. 2026-07-12 05:46 UTCEPSS rescore
  18. 2026-07-12 05:12 UTCGHSA enrichment
  19. 2026-07-11 08:27 UTCEPSS rescore
  20. 2026-07-11 08:27 UTCEPSS rescore
  21. 2026-07-11 04:27 UTCGHSA enrichment
  22. 2026-07-10 03:26 UTCGHSA enrichment
  23. 2026-07-09 19:10 UTCEPSS rescore
  24. 2026-07-09 19:10 UTCEPSS rescore
  25. 2026-07-09 02:28 UTCGHSA enrichment
  26. 2026-07-08 15:16 UTCEPSS rescore
  27. 2026-07-08 15:16 UTCEPSS rescore
  28. 2026-07-08 01:48 UTCGHSA enrichment
  29. 2026-07-07 13:46 UTCEPSS rescore
  30. 2026-07-07 13:46 UTCEPSS rescore
  31. 2026-07-07 01:07 UTCGHSA enrichment
  32. 2026-07-06 16:27 UTCEPSS rescore
  33. 2026-07-06 16:27 UTCEPSS rescore
  34. 2026-07-06 02:23 UTCEPSS rescore
  35. 2026-07-06 02:23 UTCEPSS rescore
  36. 2026-07-05 19:49 UTCGHSA enrichment
  37. 2026-07-05 02:31 UTCEPSS rescore
  38. 2026-07-05 02:30 UTCEPSS rescore
  39. 2026-07-04 19:11 UTCGHSA enrichment
  40. 2026-07-04 06:31 UTCEPSS rescore
  41. 2026-07-04 06:31 UTCEPSS rescore
  42. 2026-07-03 16:51 UTCGHSA enrichment
  43. 2026-07-02 16:14 UTCGHSA enrichment
  44. 2026-07-01 15:35 UTCGHSA enrichment
  45. 2026-07-01 15:07 UTCEPSS rescore
  46. 2026-06-30 23:22 UTCEPSS rescore
  47. 2026-06-30 14:57 UTCGHSA enrichment
  48. 2026-06-29 14:06 UTCEPSS rescore
  49. 2026-06-29 14:00 UTCGHSA enrichment
  50. 2026-06-28 14:07 UTCEPSS rescore
  51. 2026-06-28 13:22 UTCGHSA enrichment
  52. 2026-06-28 04:56 UTCEPSS rescore
  53. 2026-06-27 12:44 UTCGHSA enrichment
  54. 2026-06-27 03:08 UTCEPSS rescore
  55. 2026-06-26 12:05 UTCGHSA enrichment
  56. 2026-06-25 13:50 UTCEPSS rescore
  57. 2026-06-25 07:27 UTCGHSA enrichment
  58. 2026-06-24 14:05 UTCEPSS rescore
  59. 2026-06-24 06:49 UTCGHSA enrichment
  60. 2026-06-23 21:33 UTCEPSS rescore
  61. 2026-06-23 21:33 UTCEPSS rescore
  62. 2026-06-23 04:28 UTCGHSA enrichment
  63. 2026-06-22 14:25 UTCEPSS rescore
  64. 2026-06-22 14:25 UTCEPSS rescore
  65. 2026-06-22 03:50 UTCGHSA enrichment
  66. 2026-06-21 14:56 UTCEPSS rescore
  67. 2026-06-21 14:56 UTCEPSS rescore
  68. 2026-06-21 01:59 UTCEPSS rescore
  69. 2026-06-21 01:59 UTCEPSS rescore
  70. 2026-06-20 23:48 UTCGHSA enrichment
  71. 2026-06-19 22:44 UTCGHSA enrichment
  72. 2026-06-19 19:26 UTCEPSS rescore
  73. 2026-06-19 19:26 UTCEPSS rescore
  74. 2026-06-18 22:06 UTCGHSA enrichment
  75. 2026-06-18 17:52 UTCEPSS rescore

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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 0% probability of exploitation in the next 30 days, which ranks it in the top 82.6% of all scored CVEs.
What is the CVSS score of CVE-2026-6739?
CVE-2026-6739 has a CVSS v3 base score of 7.2 (NVD).
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.

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