Mattermost Fails to Properly Validate Team Role Modification

Mattermost versions 10.5.x = 10.5.8, 9.11.x = 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote Team Members to Guests via the PUT /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint...

CVE-2025-47870 Team invite ID leaked to team admin with no member invite privileges

Mattermost versions 10.8.x = 10.8.3, 10.5.x = 10.5.8, 9.11.x = 9.11.17, 10.9.x = 10.9.2 fail to sanitize the team invite ID in the POST /api/v4/teams/:teamId/restore endpoint which allows an team admin with no member invite privileges to get the team’s invite id...

CVE-2025-53971 Channel and Team Membership APIs inadvertently allow loss of Member privileges.

Mattermost versions 10.5.x = 10.5.8, 9.11.x = 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote Team Members to Guests via the PUT /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint...

CVE-2025-53971

Mattermost Server vulnerability CVE-2025-53971 affects versions 10.5.x ≤ 10.5.8 and 9.11.x ≤ 9.11.17. The issue arises from improper authorization validation for team scheme role modifications, allowing Team Admins to demote Team Members to Guests via PUT /api/v4/teams/{team-id}/members/{user-id}...

CVE-2025-53971 Channel and Team Membership APIs inadvertently allow loss of Member privileges.

Mattermost versions 10.5.x = 10.5.8, 9.11.x = 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote Team Members to Guests via the PUT /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint...

CVE-2024-29221

Improper Access Control in Mattermost Server versions 9.5.x before 9.5.2, 9.4.x before 9.4.4, 9.3.x before 9.3.3, 8.1.x before 8.1.11 lacked proper access control in the /api/v4/users/me/teams endpoint allowing a team admin to get the invite ID of their team, thus allowing them to invite users,...

CVE-2024-54682

Mattermost versions 10.1.x = 10.1.2, 10.0.x = 10.0.2, 9.11.x = 9.11.4, 9.5.x = 9.5.12 fail to limit the file size for slack import file uploads which allows a user to cause a DoS via zip bomb by importing data in a team they are a team admin...

CVE-2023-27265

Mattermost fails to honor the ShowEmailAddress setting when constructing a response to the "Regenerate Invite Id" API endpoint, allowing an attacker with team admin privileges to learn the team owner's email address in the response...

CVE-2023-27266

Mattermost fails to honor the ShowEmailAddress setting when constructing a response to the /api/v4/users/me/teams API endpoint, allowing an attacker with team admin privileges to learn the team owner's email address in the response...

CVE-2022-24841

fleetdm/fleet is an open source device management, built on osquery. All versions of fleet making use of the teams feature are affected by this authorization bypass issue. Fleet instances without teams, or with teams but without restricted team accounts are not affected. In affected versions a te...

SUSE CVE-2025-27715

Mattermost versions 9.11.x = 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them...

BIT-MATTERMOST-2025-27715

Mattermost versions 9.11.x = 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them...

Mattermost Server 9.11.x < 9.11.9 (MMSA-2024-00409)

The version of Mattermost Server installed on the remote host is prior to 9.11.9. It is, therefore, affected by a vulnerability as referenced in the MMSA-2024-00409 advisory. - Mattermost versions 9.11.x = 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel...

GO-2025-3555 Mattermost fail to prompt for explicit approval before adding a team admin to a private channel in github.com/mattermost/mattermost-server

Mattermost fail to prompt for explicit approval before adding a team admin to a private channel in github.com/mattermost/mattermost-server...

CVE-2025-27715

Mattermost versions 9.11.x = 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them...

Mattermost fail to prompt for explicit approval before adding a team admin to a private channel

Mattermost versions 9.11.x = 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them...

GHSA-CW7Q-5CGC-H3H9 Mattermost fail to prompt for explicit approval before adding a team admin to a private channel

Mattermost versions 9.11.x = 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them...

CVE-2025-27715

Mattermost versions 9.11.x = 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them...

CVE-2025-27715 Auto-Enrollment of Team Admins into Private Channels without explicit consent

Mattermost versions 9.11.x = 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them...

CVE-2025-27715

Mattermost CVE-2025-27715 affects Mattermost Server 9.11.x