CVE-2024-36255 Post actions can run playbook checklist task commands
Attackers can execute playbook commands as other users via deceptive post actions, requiring an upgrade to Mattermost.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2024-36255?
CVE-2024-36255 is a medium-severity vulnerability in Mattermost Mattermost Server, published on 26 May 2024. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Mattermost versions 9.5.x <= 9.5.3, 9.6.x <= 9.6.1 and 8.1.x <= 8.1.12 fail to perform proper input validation on post actions which allows an attacker to run a playbook checklist task command as another user via creating and sharing a deceptive post action that unexpectedly runs a slash command in some arbitrary channel.
Weakness: CWE-352
Which versions are affected by CVE-2024-36255?
It affects 1 product.
Products include Mattermost Mattermost Server.
How do I fix CVE-2024-36255?
No fix has been published for CVE-2024-36255 yet. Limit exposure of the affected software until one is available.
Is CVE-2024-36255 being exploited?
There is no known exploitation of CVE-2024-36255 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