CVE-2025-14573

Mattermost advisory MMSA-2025-00561 describes a vulnerability in Mattermost versions 10.11.x ≤ 10.11.9 where invite permissions are not enforced when updating team settings. This allows team administrators lacking proper permissions to bypass restrictions and add users to their team via API reque...

CVE-2025-14573 Team Admin Bypass of Invite Permissions via allow_open_invite Field

Mattermost versions 10.11.x = 10.11.9 fail to enforce invite permissions when updating team settings, which allows team administrators without proper permissions to bypass restrictions and add users to their team via API requests. Mattermost Advisory ID: MMSA-2025-00561...

CVE-2025-14350 Information disclosure via channel mentions in posts

Mattermost versions 11.1.x = 11.1.2, 10.11.x = 10.11.9, 11.2.x = 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the...

CVE-2025-14350 Information disclosure via channel mentions in posts

Mattermost versions 11.1.x = 11.1.2, 10.11.x = 10.11.9, 11.2.x = 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the...

CVE-2025-14350

Mattermost versions 11.1.x = 11.1.2, 10.11.x = 10.11.9, 11.2.x = 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the...

CVE-2025-14350

Mattermost advisory MMSA-2025-00563 covers CVE-2025-14350, affecting Mattermost versions 11.1.x (<=11.1.2), 10.11.x (<=10.11.9), and 11.2.x (

CVE-2025-14350 Information disclosure via channel mentions in posts

Mattermost versions 11.1.x = 11.1.2, 10.11.x = 10.11.9, 11.2.x = 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the...

Mattermost 安全漏洞

Mattermost is an open-source collaboration platform developed by the American company Mattermost. Versions of Mattermost such as 11.1.2 and earlier 11.1.x series as well as 10.11.9 and earlier 10.11.x series have security vulnerabilities. These vulnerabilities stem from improper authentication of...

CVE-2025-14573: Missing Authorization

Mattermost versions 10.11.x = 10.11.9 fail to enforce invite permissions when updating team settings, which allows team administrators without proper permissions to bypass restrictions and add users to their team via API requests. Mattermost Advisory ID: MMSA-2025-00561...

CVE-2025-14350: Missing Authorization

Mattermost versions 11.1.x = 11.1.2, 10.11.x = 10.11.9, 11.2.x = 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the...

PT-2026-8341

Name of the Vulnerable Software and Affected Versions Mattermost versions 10.11.0 through 10.11.9 Description Mattermost versions 10.11.x up to and including 10.11.9 do not properly enforce invite permissions when team settings are updated. This allows team administrators lacking the necessary...

Mattermost 安全漏洞

Mattermost is an open-source collaboration platform developed by the American company Mattermost. Versions of Mattermost such as 10.11.9 and earlier, including 10.11.x, have security vulnerabilities. These vulnerabilities stem from the lack of enforceable invitation permissions during the update...

PT-2026-8340

Name of the Vulnerable Software and Affected Versions Mattermost versions 10.11.x through 10.11.9 Mattermost versions 11.1.x through 11.1.2 Mattermost versions 11.2.x through 11.2.1 Description The software does not properly validate team membership when processing channel mentions. This allows...

PT-2026-25705

Name of the Vulnerable Software and Affected Versions Mattermost versions 10.11.x through 10.11.10 Mattermost versions 11.2.x through 11.2.2 Mattermost versions 11.3.x through 11.3.0 Description Mattermost fails to properly validate team-specific upload permissions. This allows a guest user to po...

CVE-2026-20796

Mattermost versions 10.11.x = 10.11.9 fail to properly validate channel membership at the time of data retrieval which allows a deactivated user to learn team names they should not have access to via a race condition in the /commonteams API endpoint.. Mattermost Advisory ID: MMSA-2025-00549...

Time-of-check Time-of-use (TOCTOU) Race Condition

Overview Affected versions of this package are vulnerable to Time-of-check Time-of-use TOCTOU Race Condition via a race condition in the /commonteams API endpoint. An attacker can gain unauthorized access to team names by exploiting the timing of channel membership validation during data retrieva...

GHSA-2XF7-HMF6-P64J Mattermost doesn't properly validate channel membership at the time of data retrieval

Mattermost versions 10.11.x = 10.11.9 fail to properly validate channel membership at the time of data retrieval which allows a deactivated user to learn team names they should not have access to via a race condition in the /commonteams API endpoint.. Mattermost Advisory ID: MMSA-2025-00549...

CVE-2026-20796

Mattermost versions 10.11.x = 10.11.9 fail to properly validate channel membership at the time of data retrieval which allows a deactivated user to learn team names they should not have access to via a race condition in the /commonteams API endpoint.. Mattermost Advisory ID: MMSA-2025-00549...

CVE-2026-20796

Mattermost versions 10.11.x = 10.11.9 fail to properly validate channel membership at the time of data retrieval which allows a deactivated user to learn team names they should not have access to via a race condition in the /commonteams API endpoint.. Mattermost Advisory ID: MMSA-2025-00549...

CVE-2026-20796

Mattermost CVE-2026-20796 affects version 10.11.x up to 10.11.9, due to improper validation of channel membership at data retrieval. A race condition in the /common_teams API endpoint can allow a deactivated user to learn team names they should not access. Root cause: insufficient validation duri...