GO-2026-4326 Mattermost is vulnerable to DoS due to infinite re-renders on API errors in github.com/mattermost/mattermost-server

Mattermost is vulnerable to DoS due to infinite re-renders on API errors 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...

GO-2026-4282 Mattermost Server is vulnerable to channel invisibility DoS via misformatted post in github.com/mattermost/mattermost-server

Mattermost Server is vulnerable to channel invisibility DoS via misformatted post 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...

GO-2026-4325 Mattermost is vulnerable to CPU exhaustion via crafted HTTP request in github.com/mattermost/mattermost-server

Mattermost is vulnerable to CPU exhaustion via crafted HTTP request 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-2025-4259 Mattermost doesn't validate user channel membership when attaching Mattermost posts as comments to Jira issues in github.com/mattermost/mattermost-server

Mattermost doesn't validate user channel membership when attaching Mattermost posts as comments to Jira issues 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. ...

GO-2026-4523 Mattermost fails to enforce invite permissions when updating team settings in github.com/mattermost/mattermost-server

Mattermost fails to enforce invite permissions when updating team settings 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...

GO-2026-4496 Mattermost doesn't validate user permissions when creating Jira issues from Mattermost posts in github.com/mattermost/mattermost-server

Mattermost doesn't validate user permissions when creating Jira issues from Mattermost posts in github.com/mattermost/mattermost-server...

GO-2026-4524 Mattermost fails to sanitize sensitive data in WebSocket messages in github.com/mattermost/mattermost-server

Mattermost fails to sanitize sensitive data in WebSocket messages 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 fro...

GO-2026-4521 Mattermost fails to properly validate team membership when processing channel mentions in github.com/mattermost/mattermost-server

Mattermost fails to properly validate team membership when processing channel mentions 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...

GO-2026-4520 Mattermost fails to properly validate login method restrictions in github.com/mattermost/mattermost-server

Mattermost fails to properly validate login method restrictions 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-2026-4495 Mattermost doesn't properly validate channel membership at the time of data retrieval in github.com/mattermost/mattermost-server

Mattermost doesn't properly validate channel membership at the time of data retrieval in github.com/mattermost/mattermost-server...

Mattermost Server 10.11.x <= 10.11.9 / 11.0.x <= 11.2.x Improper Access Control (MMSA-2025-00549)

The version of Mattermost Server installed on the remote host is affected by a vulnerability as referenced in the MMSA-2025-00549 advisory. - Mattermost versions 10.11.x = 10.11.9 and 11.0.x = 11.2.x fail to properly enforce access control checks in the common teams API. This allows the API to...

GO-2026-4463 Mattermost Server uses weak hashing for OAuth, email verification tokens and invitations in github.com/mattermost/mattermost-server

Mattermost Server uses weak hashing for OAuth, email verification tokens and invitations 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...

GO-2026-4476 Mattermost Server password reset email requests can be sent to attacker-provided email addresses in github.com/mattermost/mattermost-server

Mattermost Server password reset email requests can be sent to attacker-provided email addresses in github.com/mattermost/mattermost-server...

GO-2026-4462 Mattermost Server server restarts may provide attackers with API access in github.com/mattermost/mattermost-server

Mattermost Server server restarts may provide attackers with API access 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 repor...

GO-2026-4459 Mattermost Server vulnerable to XSS through channel headers in github.com/mattermost/mattermost-server

Mattermost Server vulnerable to XSS through channel headers 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-2026-4467 Mattermost Server has Improper Authorization for Integration Requests in github.com/mattermost/mattermost-server

Mattermost Server has Improper Authorization for Integration Requests 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-2026-4478 Mattermost Server SAML implementation does not require encryption or signature verification as default in github.com/mattermost/mattermost-server

Mattermost Server SAML implementation does not require encryption or signature verification as default 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 ...

GO-2026-4464 Mattermost Server has X.509 Improper Certificate Validation in github.com/mattermost/mattermost-server

Mattermost Server has X.509 Improper Certificate Validation in github.com/mattermost/mattermost-server...

GO-2026-4477 Mattermost Server vulnerable to user account takeover when Single Sign-On OAuth2 is used in github.com/mattermost/mattermost-server

Mattermost Server vulnerable to user account takeover when Single Sign-On OAuth2 is used 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...

GO-2026-4487 Mattermost Server allows an attacker to specify a full pathname of a log file in github.com/mattermost/mattermost-server

Mattermost Server allows an attacker to specify a full pathname of a log file 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...