The vulnerability of the Open WebUI web interface, related to the lack of authentication, allows a intruder to gain unauthorized access to protected information.

The vulnerability of the Open WebUI web interface lies in the lack of authentication when processing the endpoint /api/v1/channels/id/members with a known channel UUID. Exploiting this vulnerability could allow an attacker to gain unauthorized access to protected information...

CVE-2026-59222: Exposure of Sensitive Information to an Unauthorized Actor

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.7.0 before 0.10.0, GET /api/v1/channels//members returned full UserModelResponse objects for channel members, including settings.ui.toolServers.key and webhook configuration, allowing a normal channel...

CVE-2026-44559

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the GET /api/v1/channels/id/members endpoint only checks membership for group and dm channel types lines 467-469. For standard channels — including private ones — there is no...

SUSE CVE-2025-10545

Mattermost versions 10.5.x = 10.5.10, 10.11.x = 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the /api/v4/channels/channelid/members endpoint...

GHSA-424H-XJ87-M937 Mattermost has an Incorrect Authorization vulnerability

Mattermost versions 10.5.x = 10.5.10, 10.11.x = 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the /api/v4/channels/channelid/members endpoint...

CVE-2025-10545

Mattermost versions 10.5.x = 10.5.10, 10.11.x = 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the /api/v4/channels/channelid/members endpoint...

CVE-2025-10545 Guest user can add unauthorized team users to private channels

Mattermost versions 10.5.x = 10.5.10, 10.11.x = 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the /api/v4/channels/channelid/members endpoint...

PT-2025-42442

Name of the Vulnerable Software and Affected Versions Mattermost versions 10.5.x through 10.5.10 Mattermost versions 10.11.x through 10.11.2 Description The software does not correctly check permissions for guest users when adding members to channels. This allows guest users to add any team membe...

Mattermost 安全漏洞

Mattermost is an open source collaboration platform from Mattermost, Inc. in the United States. Mattermost suffers from a security vulnerability that can be exploited by an attacker to cause guest users to add arbitrary team members to their private channels via the...