Improper Access Control

github.com/mattermost/mattermost-server is vulnerable to Improper Access Control. The vulnerability is due to failing to validate access controls at the time of access, which allows an attacker to read a thread via AI posts...

Path Traversal

github.com/mattermost/mattermost-server is vulnerable to Path Traversal. The vulnerability is due to improper sanitization of path traversal sequences in template file destination paths, which allows an attacker system admin to perform path traversal attacks and place malicious files outside...

Improper Authorization

github.com/mattermost/mattermost-server is vulnerable to Improper Authorization. The vulnerability is due to insufficient validation of authorization for team scheme role modifications, which allows an attacker Team Admins to demote Team Members to Guests via the affected API endpoint...

Path Traversal

github.com/mattermost/mattermost-server is vulnerable to path traversal. The vulnerability is due to improper sanitization of file names, which allows an attacker with file upload permissions to overwrite file attachment thumbnails via file streaming APIs...

Mattermost Server 10.5.x < 10.5.9 / 10.8.x < 10.8.4 / 10.9.x < 10.9.4 / 10.10.x < 10.10.1 / 10.11.0 Path Traversal (MMSA-2025-00501)

The version of Mattermost Server installed on the remote host is affected by a vulnerability as referenced in the MMSA-2025-00501 advisory. - 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...

Mattermost Server 9.11.x < 9.11.18 / 10.5.x < 10.5.9 / 10.8.x < 10.8.4 / 10.9.x < 10.9.4 / 10.10.x < 10.10.1 / 10.11.0 Improper Validation (MMSA-2025-00506)

The version of Mattermost Server installed on the remote host is affected by a vulnerability as referenced in the MMSA-2025-00506 advisory. - 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 syst...

Mattermost Server 9.11.x < 9.11.18 / 10.5.x < 10.5.9 / 10.8.x < 10.8.4 / 10.9.x < 10.9.3 / 10.10.0 Multiple Vulnerabilities (MMSA-2025-00498, MMSA-2025-00499)

The version of Mattermost Server installed on the remote host is affected by multiple vulnerabilities as referenced in the MMSA-2025-00500 and MMSA-2025-00499 advisories. - 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 ...

CVE-2025-9076

Mattermost versions 10.10.x = 10.10.1 fail to properly sanitize user data during shared channel membership synchronization, which allows malicious or compromised remote clusters to access sensitive user information via unsanitized user objects. This vulnerability affects Mattermost Server instanc...

CVE-2025-9076 Mattermost Server exposes sensitive user credentials during shared channel membership synchronization

Mattermost versions 10.10.x = 10.10.1 fail to properly sanitize user data during shared channel membership synchronization, which allows malicious or compromised remote clusters to access sensitive user information via unsanitized user objects. This vulnerability affects Mattermost Server instanc...

CVE-2025-9076 Mattermost Server exposes sensitive user credentials during shared channel membership synchronization

Mattermost versions 10.10.x = 10.10.1 fail to properly sanitize user data during shared channel membership synchronization, which allows malicious or compromised remote clusters to access sensitive user information via unsanitized user objects. This vulnerability affects Mattermost Server instanc...

CVE-2025-9076

Mattermost Server (10.10.x, affected

Mattermost Server 9.11.x < 9.11.18 / 10.5.x < 10.5.9 / 10.8.x < 10.8.4 / 10.9.x < 10.9.3 / 10.10.x < 10.10.1 / 10.11.0 Unrestricted Upload of File (MMSA-2025-00505)

The version of Mattermost Server installed on the remote host is affected by a vulnerability as referenced in the MMSA-2025-00505 advisory. - 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...

Mattermost Server 9.11.x < 9.11.18 / 10.5.x < 10.5.9 / 10.10.0 Incorrect Authorization (MMSA-2025-00485)

The version of Mattermost Server installed on the remote host is affected by a vulnerability as referenced in the MMSA-2025-00485 advisory. - 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 t...

GO-2025-3911 Mattermost has Potential Server Crash due to Unvalidated Import Data in github.com/mattermost/mattermost-server

Mattermost has Potential Server Crash due to Unvalidated Import Data in github.com/mattermost/mattermost-server. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. If this is causing false-positive reports...

GO-2025-3906 Mattermost Server SSRF Vulnerability via the Agents Plugin in github.com/mattermost/mattermost-server

Mattermost Server SSRF Vulnerability via the Agents Plugin in github.com/mattermost/mattermost-server...

GO-2025-3907 Mattermost Fails to Sanitize Path Traversal Sequences in github.com/mattermost/mattermost-server

Mattermost Fails to Sanitize Path Traversal Sequences in github.com/mattermost/mattermost-server...

GO-2025-3904 Mattermost Fails to Validate Remote Cluster Upload Sessions in github.com/mattermost/mattermost-server

Mattermost Fails to Validate Remote Cluster Upload Sessions in github.com/mattermost/mattermost-server. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. If this is causing false-positive reports from...

GO-2025-3901 Mattermost Fails to Validate File Paths in github.com/mattermost/mattermost-server

Mattermost Fails to Validate File Paths in github.com/mattermost/mattermost-server. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. If this is causing false-positive reports from vulnerability scanners,...

GO-2025-3902 Mattermost Fails to Properly Validate Team Role Modification in github.com/mattermost/mattermost-server

Mattermost Fails to Properly Validate Team Role Modification in github.com/mattermost/mattermost-server...

CVE-2025-47700

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...