CVE-2026-7387

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-12. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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 Mattermost fails to require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints, which allows a user with group-link permissions to escalate themselves and group members to team or channel admin via crafted API requests.. Mattermost Advisory ID: MMSA-2026-00665

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100

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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.4%
EPSS %ILE
34th
KEV
Not listed

Published

June 12, 2026

Last Modified

June 18, 2026

Advisory Details (1)

Auto-updated Jun 12, 2026
Patch available.
generic

Security Updates

https://mattermost.com/security-updates

Vendor Advisories for CVE-2026-7387(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 1 ecosystem)
Go(4)
PackageVulnerable rangeFix by version rangeDependents
github.com/mattermost/mattermost-server11.6.0
  • 11.6.0 up to 11.6.1: fixed in 11.6.1
  • 11.5.0 up to 11.5.5: fixed in 11.5.5
  • 10.11.0 up to 10.11.17: fixed in 10.11.17
  • 10.11.0+incompatible up to 10.11.17+incompatible: fixed in 10.11.17+incompatible
  • 11.5.0+incompatible up to 11.5.5+incompatible: fixed in 11.5.5+incompatible
  • 11.6.0+incompatible up to 11.6.1+incompatible: fixed in 11.6.1+incompatible
—
github.com/mattermost/mattermost-server/v5—
  • every version on: no fix on record
—
github.com/mattermost/mattermost-server/v6—
  • every version on: no fix on record
—
github.com/mattermost/mattermost/server/v8—
  • 8.0.0-20250731163400-5b955468ea1e up to 8.0.0-20260506065351-202d125afa87: fixed in 8.0.0-20260506065351-202d125afa87
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 27× 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 265 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-7387?
CVE-2026-7387 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 Mattermost fails to require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints, which allows a user with group-link permissions to escalate…
When was CVE-2026-7387 disclosed?
CVE-2026-7387 was first published 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-2026-7387 actively exploited?
CVE-2026-7387 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (34th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-7387?
CVE-2026-7387 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-7387?
A fix for CVE-2026-7387 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-7387 are linked in the Vendor Advisories panel on this page.

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