Improper Authorization

Mattermost is vulnerable to an Improper Authorization. The vulnerability is due to insufficient enforcement of channel conversion restrictions due to a flaw that allows users with permission to convert public channels to private ones to also convert private channels to public...

SUSE CVE-2025-24920

Mattermost versions 10.4.x = 10.4.2, 10.3.x = 10.3.3, 9.11.x = 9.11.8, 10.5.x = 10.5.0 fail to restrict bookmark creation and updates in archived channels, which allows authenticated users created or update bookmarked in archived channels...

SUSE CVE-2025-25274

Mattermost versions 10.4.x = 10.4.2, 10.3.x = 10.3.3, 9.11.x = 9.11.8 fail to restrict command execution in archived channels, which allows authenticated users to run commands in archived channels...

BIT-MATTERMOST-2025-24920

Mattermost versions 10.4.x = 10.4.2, 10.3.x = 10.3.3, 9.11.x = 9.11.8, 10.5.x = 10.5.0 fail to restrict bookmark creation and updates in archived channels, which allows authenticated users created or update bookmarked in archived channels...

BIT-MATTERMOST-2025-25274

Mattermost versions 10.4.x = 10.4.2, 10.3.x = 10.3.3, 9.11.x = 9.11.8 fail to restrict command execution in archived channels, which allows authenticated users to run commands in archived channels...

Mattermost Server 10.4.x < 10.4.3 / 10.3.x < 10.3.4 /9.11.x < 9.11.9 / 10.5.x < 10.5.1 (MMSA-2025-00432)

The version of Mattermost Server installed on the remote host is prior to 10.4.4 / 10.3.4 / 9.11.9 / 10.5.1. It is, therefore, affected by a vulnerability as referenced in the MMSA-2025-00432 advisory. - Mattermost versions 10.4.x = 10.4.2, 10.3.x = 10.3.3, 9.11.x = 9.11.8, 10.5.x = 10.5.0 fail t...

Mattermost Server 9.11.x < 9.11.9 / 10.3.x < 10.3.4 / 10.4.x < 10.4.3 (MMSA-2025-00421)

The version of Mattermost Server installed on the remote host is prior to 9.11.9, 10.3.4, or 10.4.3. It is, therefore, affected by a vulnerability as referenced in the MMSA-2025-00421 advisory. - Mattermost versions 10.4.x = 10.4.2, 10.3.x = 10.3.3, 9.11.x = 9.11.8 fail to restrict command...

The vulnerability of the ethnl_set_channels() function in the Linux operating system’s kernel allows a hacker to cause a service failure.

The vulnerability of the ethnlsetchannels function in the Linux operating system’s kernel is related to the execution of operations outside the buffer in memory. Exploiting this vulnerability can allow an attacker to cause a service failure...

Incorrect Authorization

Overview github.com/mattermost/mattermost/server/v8/channels/api4 is a platform for secure collaboration across the entire software development lifecycle Affected versions of this package are vulnerable to Incorrect Authorization in the createChannelBookmark and updateChannelBookmark functions in...

GO-2025-3556 Mattermost allows members with permission to convert public channels to private and convert private to public in github.com/mattermost/mattermost-server

Mattermost allows members with permission to convert public channels to private and convert private to public in github.com/mattermost/mattermost-server...

GO-2025-3552 Mattermost Fails to Restrict Bookmark Creation and Updates in Archived Channels in github.com/mattermost/mattermost-server

Mattermost Fails to Restrict Bookmark Creation and Updates in Archived Channels in github.com/mattermost/mattermost-server...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization in the createChannelBookmark and updateChannelBookmark functions in channelbookmark.go. This allows attackers to create and update bookmarks on archived channels. Remediation Upgrade...

GO-2025-3550 Mattermost Fails to Restrict Command Execution in Archived Channels in github.com/mattermost/mattermost-server

Mattermost Fails to Restrict Command Execution in Archived Channels in github.com/mattermost/mattermost-server...

CVE-2025-27933

Mattermost versions 10.4.x = 10.4.2, 10.3.x = 10.3.3, 9.11.x = 9.11.8 fail to fail to enforce channel conversion restrictions, which allows members with permission to convert public channels to private ones to also convert private ones to public...

CVE-2025-24920

Mattermost versions 10.4.x = 10.4.2, 10.3.x = 10.3.3, 9.11.x = 9.11.8, 10.5.x = 10.5.0 fail to restrict bookmark creation and updates in archived channels, which allows authenticated users created or update bookmarked in archived channels...

How Cybercriminals Exploit Notification Channels

Cybercriminals are always looking for new ways to take advantage of people. One effective method they use is…...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization in command.go that allows a user to execute commands on archived channels. Remediation Upgrade github.com/mattermost/mattermost/server/channels/api4 to version 9.11.9-rc1, 10.3.4, 10.4.3 or higher. References -...

Mattermost Fails to Restrict Command Execution in Archived Channels

Mattermost versions 10.4.x = 10.4.2, 10.3.x = 10.3.3, 9.11.x = 9.11.8 fail to restrict command execution in archived channels, which allows authenticated users to run commands in archived channels...

Missing Authentication for Critical Function

Overview Affected versions of this package are vulnerable to Missing Authentication for Critical Function due to servePluginRequest failing to enforce multifactor authentication for plugins, even when MFA is meant to be enabled. Remediation Upgrade...

Mattermost Fails to Restrict Bookmark Creation and Updates in Archived Channels

Mattermost versions 10.4.x = 10.4.2, 10.3.x = 10.3.3, 9.11.x = 9.11.8, 10.5.x = 10.5.0 fail to restrict bookmark creation and updates in archived channels, which allows authenticated users created or update bookmarked in archived channels...