CVE-2025-41395 Webapp DoS via malicious retrospective post in Playbooks
An attacker can cause a denial of service for all users by creating a maliciously crafted retrospective post in the Mattermost Playbooks plugin.
- 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-2025-41395?
CVE-2025-41395 is a medium-severity denial of service vulnerability in Mattermost Mattermost Server, published on 24 Apr 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.10 fail to properly validate the props used by the RetrospectivePost custom post type in the Playbooks plugin, which allows an attacker to create a specially crafted post with maliciously crafted props and cause a denial of service (DoS) of the web app for all users.
Weakness: CWE-1287
Which versions are affected by CVE-2025-41395?
21 open source packages ship an affected version, including github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-plugin-playbooks 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 | All versions | 8.0.0-20250218121836-2b5275d87136 |
github.com/mattermost/mattermost/server/v8 Go | All versions | 8.0.0-20250218121836-2b5275d87136 |
github.com/mattermost/mattermost/server/v8 Go | All versions | 8.0.0-20250218121836-2b5275d87136 |
github.com/mattermost/mattermost/server/v8 Go | From 10.4.0 | None |
github.com/mattermost/mattermost/server/v8 Go | From 10.4.0 | None |
15 more packages
github.com/mattermost/mattermost/server/v8 Go | From 10.5.0 | None |
github.com/mattermost/mattermost/server/v8 Go | From 10.5.0 | None |
github.com/mattermost/mattermost/server/v8 Go | From 9.11.0 | None |
github.com/mattermost/mattermost/server/v8 Go | From 9.11.0 | None |
github.com/mattermost/mattermost-plugin-playbooks Go | All versions | None |
github.com/mattermost/mattermost-plugin-playbooks Go | All versions | 1.41.0 |
github.com/mattermost/mattermost-plugin-playbooks Go | All versions | 1.41.0 |
github.com/mattermost/mattermost-plugin-playbooks Go | All versions | 1.41.0 |
github.com/mattermost/mattermost-plugin-playbooks Go | From 2.0.0 | None |
github.com/mattermost/mattermost-plugin-playbooks Go | From 2.0.0 | None |
github.com/mattermost/mattermost-server Go | From 10.4.0+incompatible | None |
github.com/mattermost/mattermost-server Go | From 10.5.0+incompatible | None |
github.com/mattermost/mattermost-server Go | From 9.11.0+incompatible | None |
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-2025-41395?
Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20250218121836-2b5275d87136 or later.
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-2025-41395 being exploited?
There is no known exploitation of CVE-2025-41395 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-3g36-gf7c-75qw, GO-2025-3642.