CVE-2024-1888 Existing server guests invited to the team by members without "invite_guest" permission
Mattermost allows members to invite existing server guests to teams without the required invite_guest permission, potentially granting unauthorized access.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-1888?
CVE-2024-1888 is a medium-severity missing authorization vulnerability in Mattermost Mattermost Server, published on 29 Feb 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Mattermost fails to check the "invite_guest" permission when inviting guests of other teams to a team, allowing a member with permissions to add other members but not to add guests to add a guest to a team as long as the guest was already a guest in another team of the server
Weakness: CWE-284
Which versions are affected by CVE-2024-1888?
12 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.
| Package | Affected | Fixed in |
|---|---|---|
github.com/mattermost/mattermost/server/v8 Go | All versions | None |
github.com/mattermost/mattermost/server/v8 Go | All versions | 8.1.9 |
github.com/mattermost/mattermost/server/v8 Go | All versions | 8.1.9 |
github.com/mattermost/mattermost/server/v8 Go | From 9.2.0 | 9.2.5 |
github.com/mattermost/mattermost/server/v8 Go | From 9.2.0 | 9.2.5 |
github.com/mattermost/mattermost/server/v8 Go | From 9.3.0 | 9.3.1 |
6 more packages
github.com/mattermost/mattermost/server/v8 Go | From 9.3.0 | 9.3.1 |
github.com/mattermost/mattermost/server/v8 Go | From 9.4.0 | 9.4.2 |
github.com/mattermost/mattermost/server/v8 Go | From 9.4.0 | 9.4.2 |
github.com/mattermost/mattermost-server Go | From 9.2.0+incompatible | 9.2.5+incompatible, 9.3.1+incompatible, 9.4.2+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-2024-1888?
Upgrade github.com/mattermost/mattermost/server/v8 to a fixed version for your release line: 8.1.9, 9.2.5, 9.3.1 or 9.4.2.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2024-1888 being exploited?
There is no known exploitation of CVE-2024-1888 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-pfw6-5rx3-xh3c, GO-2024-2593.