CVE-2024-29221 Invite ID available to team admins even without the "Add Members" permission
Team admins can bypass permission restrictions to obtain invite IDs and add members, undermining access control policies in Mattermost.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-29221?
CVE-2024-29221 is a medium-severity missing authorization vulnerability in Mattermost Mattermost Server, published on 5 Apr 2024. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
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, even if the "Add Members" permission was explicitly removed from team admins.
Weakness: CWE-284
Which versions are affected by CVE-2024-29221?
13 open source packages ship an affected version, including github.com/mattermost/mattermost/server/v8, mattermost and github.com/mattermost/mattermost-server. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/mattermost/mattermost/server/v8 Go | All versions | None |
github.com/mattermost/mattermost/server/v8 Go | From 8.1.0 | 8.1.11 |
github.com/mattermost/mattermost/server/v8 Go | From 8.1.0 | 8.1.11 |
github.com/mattermost/mattermost/server/v8 Go | From 9.3.0 | 9.3.3 |
github.com/mattermost/mattermost/server/v8 Go | From 9.3.0 | 9.3.3 |
github.com/mattermost/mattermost/server/v8 Go | From 9.4.0 | 9.4.4 |
7 more packages
github.com/mattermost/mattermost/server/v8 Go | From 9.4.0 | 9.4.4 |
github.com/mattermost/mattermost/server/v8 Go | From 9.5.0 | 9.5.2 |
github.com/mattermost/mattermost/server/v8 Go | From 9.5.0 | 9.5.2 |
mattermost Bitnami | From 8.1.0 | 8.1.11, 9.3.3, 9.4.4, 9.5.2 |
github.com/mattermost/mattermost-server Go | From 9.3.0+incompatible | 9.3.3+incompatible, 9.4.4+incompatible, 9.5.2+incompatible |
github.com/mattermost/mattermost-server/v5 Go | All versions | None |
github.com/mattermost/mattermost-server/v6 Go | All versions | None |
Products include Mattermost Mattermost Server.
How do I fix CVE-2024-29221?
Upgrade github.com/mattermost/mattermost/server/v8 to a fixed version for your release line: 8.1.11, 9.3.3, 9.4.4 or 9.5.2.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2024-29221 being exploited?
There is no known exploitation of CVE-2024-29221 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 BIT-mattermost-2024-29221, GHSA-w67v-ph4x-f48q, GO-2024-2706.