CVE-2024-23488 Files of archived channels accessible with the “Allow users to view archived channels” option disabled
Attackers can access files from archived channels despite disabled viewing permissions, exposing sensitive data to unauthorized users.
- 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-2024-23488?
CVE-2024-23488 is a low-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 properly restrict the access of files attached to posts in an archived channel, resulting in members being able to access files of archived channels even if the “Allow users to view archived channels” option is disabled.
Weakness: CWE-284
Which versions are affected by CVE-2024-23488?
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.
| 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 9.0.0 | 9.4.2 |
github.com/mattermost/mattermost/server/v8 Go | From 9.0.0 | 9.4.2 |
github.com/mattermost/mattermost-server Go | From 9.0.0+incompatible | 9.4.2+incompatible |
2 more packages
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-2024-23488?
Upgrade github.com/mattermost/mattermost/server/v8 to a fixed version for your release line: 8.1.9 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-2024-23488 being exploited?
There is no known exploitation of CVE-2024-23488 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-xgxj-j98c-59rv, GO-2024-2595.