GO-2025-4190 Mattermost Server is vulnerable to XSS attacks against an OAuth 2.0 allow/deny page in github.com/mattermost/mattermost-server

Mattermost Server is vulnerable to XSS attacks against an OAuth 2.0 allow/deny page in github.com/mattermost/mattermost-server...

GO-2025-4184 Mattermost Server vulnerable to Denial of Service through `@` character prefix inserted into JavaScript field names in github.com/mattermost/mattermost-server

Mattermost Server vulnerable to Denial of Service through @ character prefix inserted into JavaScript field names in github.com/mattermost/mattermost-server...

GO-2025-4189 Mattermost Server is vulnerable to XSS through author_link field in Slack attachments in github.com/mattermost/mattermost-server

Mattermost Server is vulnerable to XSS through authorlink field in Slack attachments in github.com/mattermost/mattermost-server...

GO-2025-4186 Mattermost Server does not prevent System Admin from arbitrary file creation in github.com/mattermost/mattermost-server

Mattermost Server does not prevent System Admin from arbitrary file creation 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-2025-4197 Mattermost Server exposes OAuth personal access tokens to attackers in github.com/mattermost/mattermost-server

Mattermost Server exposes OAuth personal access tokens to attackers in github.com/mattermost/mattermost-server...

GO-2025-4198 Mattermost Server has low entropy for authorization data as an OAuth 2.0 Service Provider in github.com/mattermost/mattermost-server

Mattermost Server has low entropy for authorization data as an OAuth 2.0 Service Provider in github.com/mattermost/mattermost-server...

GO-2025-4185 Mattermost Server exposes team invite IDs through API endpoints in github.com/mattermost/mattermost-server

Mattermost Server exposes team invite IDs through API endpoints in github.com/mattermost/mattermost-server...

Timing-Based Side-Channel Attack

github.com/mattermost/mattermost-server is vulnerable to timing-based side-channel attacks. The vulnerability is due to improper use of constant-time comparison for sensitive strings, which allows an attacker to exploit timing oracles to perform byte-by-byte brute-force attacks on Cloud API keys...

Improper Access Control

github.com/mattermost/mattermost-server is vulnerable to improper access control. The vulnerability is due to Mattermost failing to verify whether a user has permission to join a team when using the original invite token, which allows an attacker to manipulate the OAuth state and join any team on...

Improper Access Control

github.com/mattermost/mattermost-server is vulnerable to improper access control. The vulnerability is due to insufficient validation of guest user permissions when accessing channel information, which allows an attacker to discover active public channels and their metadata via the...

Incorrect Implementation of Authentication Algorithm

Overview Affected versions of this package are vulnerable to Incorrect Implementation of Authentication Algorithm. An attacker can gain unauthorized access to another user's account by leveraging a specially crafted email address when switching authentication methods and sending a request to the...

Incorrect Implementation of Authentication Algorithm

Overview Affected versions of this package are vulnerable to Incorrect Implementation of Authentication Algorithm. An attacker can gain unauthorized access to another user's account by leveraging a specially crafted email address when switching authentication methods and sending a request to the...

Information Exposure

Overview Affected versions of this package are vulnerable to Information Exposure via the GET /api/v4/channels/channelid/commonteams endpoint. An attacker can access team email addresses intended to be visible only to Team Admins by making authenticated requests to this endpoint. Remediation...

GO-2025-4146 Mattermost Server is vulnerable to a Denial of Service attack through `invite_people` command in github.com/mattermost/mattermost-server

Mattermost Server is vulnerable to a Denial of Service attack through invitepeople command in github.com/mattermost/mattermost-server...

GO-2025-4133 Mattermost allows other users to determine when users had read channels via channel member objects in github.com/mattermost/mattermost-server

Mattermost allows other users to determine when users had read channels via channel member objects 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...

GO-2025-4130 Mattermost allows system administrators to access password hashes and MFA secrets in github.com/mattermost/mattermost-server

Mattermost allows system administrators to access password hashes and MFA secrets in github.com/mattermost/mattermost-server...

GO-2025-4128 Mattermost does not enforce MFA on WebSocket connections in github.com/mattermost/mattermost-server

Mattermost does not enforce MFA on WebSocket connections in github.com/mattermost/mattermost-server...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization via the /api/v4/teams/teamid/channels/searcharchived endpoint. An attacker can access information about archived public channels by sending crafted requests as a guest user. Remediation Upgrade...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization via the /api/v4/teams/teamid/channels/searcharchived endpoint. An attacker can access information about archived public channels by sending crafted requests as a guest user. Remediation Upgrade...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization via the /api/v4/teams/teamid/channels/searcharchived endpoint. An attacker can access information about archived public channels by sending crafted requests as a guest user. Remediation Upgrade...