8.8

CVE-2026-7387

Mattermost group syncable endpoints allow privilege escalation via scheme_admin

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
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerMattermost
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Produkt Mattermost
Default Statusunaffected
Version <= 11.6.1
Version 11.6.0
Status affected
Version <= 11.5.4
Version 11.5.0
Status affected
Version <= 10.11.15
Version 10.11.0
Status affected
Version <= 10.11.16
Version 10.11.0
Status affected
Version 11.7.0
Status unaffected
Version 11.6.2
Status unaffected
Version 11.5.5
Status unaffected
Version 10.11.16
Status unaffected
Version 10.11.17
Status unaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.3% 0.212
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
responsibledisclosure@mattermost.com 8.8 2.8 5.9
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-863 Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

https://mattermost.com/security-updates