Summary
Ein authentifizierter Angreifer mit bestimmten Berechtigungen kann diese Schwachstellen ausnutzen, um Sicherheitsmechanismen zu umgehen, beliebige Dateien in das Dateisystem einzubringen und potenziell beliebigen Code auszuführen.
Product
Mattermost ist ein webbasierter Instant-Messaging-Dienst.
Vulnerabilities 9
-
Medium 6.8
Import Path Traversal Enables Unauthorized Unsigned Plugin Installation
Mattermost versions 10.9.x <= 10.9.1, 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate file paths during plugin import operations which allows restricted admin users to install unauthorized custom plugins via path traversal in t…
-
Medium 6.8
Mattermost Shared Channel Upload Type Validation Bypass
Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.9.x <= 10.9.2, 10.10.x <= 10.10.0 fail to validate upload types in remote cluster upload sessions which allows a system admin to upload non-attachment file types via shared channels…
-
Medium 6.8
Path Traversal in Template Upload Allows Uploading Files Outside Target Directory
Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.9.x <= 10.9.2 fails to sanitize path traversal sequences in template file destination paths, which allows a system admin to perform path traversal attacks via malicious path compone…
-
Medium 4.9
Nil pointer dereference in bulk import crashes server
Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.0, 10.9.x <= 10.9.3 fail to validate import data which allows a system admin to crash the server via the bulk import feature.
-
Medium 4.3
Team invite ID leaked to team admin with no member invite privileges
Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.9.x <= 10.9.2 fail to sanitize the team invite ID in the POST /api/v4/teams/:teamId/restore endpoint which allows an team admin with no member invite privileges to get the team’s in…
-
Medium 4.3
Path traversal in image upload with preview overwrite
Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 10.10.x <= 10.10.0, 10.9.x <= 10.9.3 fail to sanitize file names which allows users with file upload permission to overwrite file attachment thumbnails via path traversal in file streaming APIs.
-
Low 3.8
Channel and Team Membership APIs inadvertently allow loss of Member privileges.
Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote Team Members to Guests via the PUT /api/v4/teams/team-id/members/user-id/schemeRoles API endp…
-
Low 3.5
AI plugin APIs can be triggered using post actions
Mattermost Server versions 10.5.x <= 10.5.9 utilizing the Agents plugin fail to reject empty request bodies which allows users to trick users into clicking malicious links via post actions
-
Low 3.5
Thread summarization allows persistent access to channel
Mattermost versions 10.5.x <= 10.5.8 fail to validate access controls at time of access which allows user to read a thread via AI posts
Revision history
-
#3
CVE- und EUVD-Referenzen ergänzt
-
#2
Neue Informationen und CVE von Mattermost aufgenommen
-
#1
Initiale Fassung
References
-
Mattermost Server Security Updates vom 2025-07-22
https://mattermost.com/security-updates/#server
-
Mattermost Plugins Security Updates vom 2025-07-22
https://mattermost.com/security-updates/#plugins