GO-2026-5474 Mattermost doesn't enforce client identity binding during the OAuth authorization code redemption flow in github.com/mattermost/mattermost-server

Mattermost doesn't enforce client identity binding during the OAuth authorization code redemption flow 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-2026-5432 Mattermost doesn't validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation in github.com/mattermost/mattermost-server

Mattermost doesn't validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation in github.com/mattermost/mattermost-server. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standar...

GO-2026-5454 Mattermost doesn't validate the response body of proxied images in github.com/mattermost/mattermost-server

Mattermost doesn't validate the response body of proxied images in github.com/mattermost/mattermost-server...

GO-2026-5484 Mattermost doesn't escape some variables that could contain malicious content during error page composition in github.com/mattermost/mattermost-server

Mattermost doesn't escape some variables that could contain malicious content during error page composition 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...

GO-2026-5442 Mattermost doesn't enforce the PostEditTimeLimit on non-message post fields in github.com/mattermost/mattermost-server

Mattermost doesn't enforce the PostEditTimeLimit on non-message post fields in github.com/mattermost/mattermost-server...

GO-2026-5489 Mattermost doesn't limit the size of the request body on the start meeting API endpoint in github.com/mattermost/mattermost-plugin-msteams-meetings

Mattermost doesn't limit the size of the request body on the start meeting API endpoint in github.com/mattermost/mattermost-plugin-msteams-meetings...

GO-2026-5495 Mattermost doesn't validate CSRF tokens on an authentication endpoint in github.com/mattermost/mattermost-server

Mattermost doesn't validate CSRF tokens on an authentication endpoint in github.com/mattermost/mattermost-server...

CVE-2026-2299

The Mattermost Google Drive plugin before version 1.1.0 fails to validate channel membership in the file creation endpoint, allowing authenticated users with a connected Google account to share Google Drive files to unauthorized private channels and disclose private channel membership...

CVE-2026-2299

CVE-2026-2299 affects the Mattermost Google Drive plugin prior to version 1.1.0. The file creation endpoint does not validate channel membership, allowing authenticated users with a connected Google account to share Google Drive files into unauthorized private channels and disclose private channe...

CVE-2026-2299 Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint

The Mattermost Google Drive plugin before version 1.1.0 fails to validate channel membership in the file creation endpoint, allowing authenticated users with a connected Google account to share Google Drive files to unauthorized private channels and disclose private channel membership...

CVE-2026-2299

The Mattermost Google Drive plugin before version 1.1.0 fails to validate channel membership in the file creation endpoint, allowing authenticated users with a connected Google account to share Google Drive files to unauthorized private channels and disclose private channel membership...

EUVD-2026-39540

The Mattermost Google Drive plugin before version 1.1.0 fails to validate channel membership in the file creation endpoint, allowing authenticated users with a connected Google account to share Google Drive files to unauthorized private channels and disclose private channel membership...

CVE-2026-2299 Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint

The Mattermost Google Drive plugin before version 1.1.0 fails to validate channel membership in the file creation endpoint, allowing authenticated users with a connected Google account to share Google Drive files to unauthorized private channels and disclose private channel membership...

GO-2026-5393 Mattermost has an Incorrect Authorization issue in github.com/mattermost/mattermost-server

Mattermost has an Incorrect Authorization issue in github.com/mattermost/mattermost-server...

GO-2026-5293 Mattermost doesn't sanitize sensitive configuration fields before including them in support packet generation in github.com/mattermost/mattermost-server

Mattermost doesn't sanitize sensitive configuration fields before including them in support packet generation 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. I...

GO-2026-5311 Mattermost has a Path Traversal issue in github.com/mattermost/mattermost-server

Mattermost has a Path Traversal issue in github.com/mattermost/mattermost-server...

GO-2026-5325 Mattermost doesn't validate 7zip archive structure before processing in github.com/mattermost/mattermost-server

Mattermost doesn't validate 7zip archive structure before processing 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-2026-5360 Mattermost allows attackers to take over arbitrary user accounts via overly permissive substring matching flaw in github.com/mattermost/mattermost-server

Mattermost allows attackers to take over arbitrary user accounts via overly permissive substring matching flaw in github.com/mattermost/mattermost-server...

GO-2026-5245 Mattermost: Authenticated DoS through failure to prevent rendering of external SVGs on link embeds in github.com/mattermost/mattermost-server

Mattermost: Authenticated DoS through failure to prevent rendering of external SVGs on link embeds in github.com/mattermost/mattermost-server...

GO-2026-5238 Mattermost doesn't sanitize sensitive configuration fields in the Mattermost Calls plugin in github.com/mattermost/mattermost-plugin-calls

Mattermost doesn't sanitize sensitive configuration fields in the Mattermost Calls plugin in github.com/mattermost/mattermost-plugin-calls...