CVE-2024-24988 Excessive resource consumption when sending long emoji names in user custom status
An attacker can crash the Mattermost server by sending excessively long emoji strings in custom user status, causing resource exhaustion.
- 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-2024-24988?
CVE-2024-24988 is a medium-severity denial of service 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 validate the length of the emoji value in the custom user status, allowing an attacker to send multiple times a very long string as an emoji value causing high resource consumption and possibly crashing the server.
Weakness: CWE-400
Which versions are affected by CVE-2024-24988?
9 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 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 |
github.com/mattermost/mattermost/server/v8 Go | From 9.3.0 | 9.3.1 |
mattermost Bitnami | All versions | 8.1.8, 9.1.5, 9.2.4 |
3 more packages
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-2024-24988?
Upgrade github.com/mattermost/mattermost/server/v8 to a fixed version for your release line: 9.2.5 or 9.3.1.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2024-24988 being exploited?
There is no known exploitation of CVE-2024-24988 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-2024-24988, GHSA-6mx3-9qfh-77gj, GO-2024-2589.