CVE-2025-22449 Access control flaw for team admins allows unauthorized team additions

What is CVE-2025-22449?

CVE-2025-22449 is a low-severity missing authorization vulnerability in Mattermost Mattermost Server, published on 9 Jan 2025. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

Mattermost versions 9.11.x <= 9.11.5 fail to enforce invite permissions, which allows team admins, with no permission to invite users to their team, to invite users by updating the "allow_open_invite" field via making their team public.

Weakness: CWE-863

Which versions are affected by CVE-2025-22449?

8 open source packages ship an affected version, including github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-server and github.com/mattermost/mattermost-server/v5. It affects 1 product.

Products include Mattermost Mattermost Server.

How do I fix CVE-2025-22449?

Upgrade github.com/mattermost/mattermost/server/v8 to a fixed version for your release line: 8.0.0-20250102081831-64c566a8280b or 9.11.6.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2025-22449 being exploited?

There is no known exploitation of CVE-2025-22449 in the wild and no public exploit code.

Other vulnerabilities in Mattermost Mattermost Server

• CVE-2025-12419 Account takeover on OAuth/OpenID-enabled servers Critical 9.9
• CVE-2025-12421 Account Takeover via Code Exchange Endpoint Critical 9.9
• CVE-2025-4981 Path Traversal Leading to RCE by Any Authenticated Mattermost User Critical 9.9
• CVE-2025-20051 Arbitrary file read via block duplication in Mattermost Boards Critical 9.9
• CVE-2025-25279 Arbitrary file read in Mattermost Boards via import & export board archive Critical 9.9

All Mattermost Mattermost Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-q8fg-cp3q-5jwm, GO-2025-3377.