CVE-2024-4195 Mattermost allows team admins to promote guests to team admins
A team admin can improperly promote guests to team admin status due to insufficient role validation, allowing unauthorized privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-4195?
CVE-2024-4195 is a low-severity vulnerability in Mattermost Mattermost Server, published on 26 Apr 2024. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Mattermost versions 9.6.0, 9.5.x before 9.5.3, and 8.1.x before 8.1.12 fail to fully validate role changes, which allows an attacker authenticated as a team admin to promote guests to team admins via crafted HTTP requests.
Weakness: CWE-284
Which versions are affected by CVE-2024-4195?
5 open source packages ship an affected version, including github.com/mattermost/mattermost-server. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/mattermost/mattermost-server Go | From 8.1.0 | 8.1.12 |
github.com/mattermost/mattermost-server Go | From 8.1.0 | 8.1.12 |
github.com/mattermost/mattermost-server Go | From 8.1.0+incompatible | 8.1.12+incompatible, 9.5.3+incompatible |
github.com/mattermost/mattermost-server Go | From 9.5.0 | 9.5.3 |
github.com/mattermost/mattermost-server Go | From 9.5.0 | 9.5.3 |
Products include Mattermost Mattermost Server.
How do I fix CVE-2024-4195?
Upgrade github.com/mattermost/mattermost-server to a fixed version for your release line: 8.1.12, 8.1.12+incompatible, 9.5.3+incompatible or 9.5.3.
Is CVE-2024-4195 being exploited?
There is no known exploitation of CVE-2024-4195 in the wild and no public exploit code.
Other vulnerabilities in Mattermost Mattermost Server
- CVE-2025-12419 Account takeover on OAuth/OpenID-enabled servers
- CVE-2025-12421 Account Takeover via Code Exchange Endpoint
- CVE-2025-4981 Path Traversal Leading to RCE by Any Authenticated Mattermost User
- CVE-2025-20051 Arbitrary file read via block duplication in Mattermost Boards
- CVE-2025-25279 Arbitrary file read in Mattermost Boards via import & export board archive
Sources
Also known as GHSA-5fh7-7mw7-mmx5, GO-2024-2793.