CVE-2024-1887 Public channel post content accessible without membership when compliance export is enabled
Attackers can read public channel posts without membership when compliance export is enabled, bypassing audit controls.
- 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-2024-1887?
CVE-2024-1887 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 if compliance export is enabled when fetching posts of public channels allowing a user that is not a member of the public channel to fetch the posts, which will not be audited in the compliance export.
Weakness: CWE-284
Which versions are affected by CVE-2024-1887?
10 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 |
4 more packages
github.com/mattermost/mattermost/server/v8 Go | From 9.3.0 | 9.3.1 |
github.com/mattermost/mattermost-server Go | From 9.2.0+incompatible | 9.2.5+incompatible, 9.3.1+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-2024-1887?
Upgrade github.com/mattermost/mattermost/server/v8 to a fixed version for your release line: 8.1.9, 9.2.5 or 9.3.1.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2024-1887 being exploited?
There is no known exploitation of CVE-2024-1887 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-fx48-xv6q-6gp3, GO-2024-2591.