CVE-2025-20630 Mobile crash via object that can't be cast to String in Attachment Field
An attacker can crash the Mattermost mobile application by sending a post with attachment fields that cannot be cast to a String.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-20630?
CVE-2025-20630 is a medium-severity denial of service vulnerability in Mattermost, published on 16 Jan 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Mattermost Mobile versions <=2.22.0 fail to properly handle posts with attachments containing fields that cannot be cast to a String, which allows an attacker to cause the mobile to crash via creating and sending such a post to a channel.
Weakness: CWE-1287
Which versions are affected by CVE-2025-20630?
It affects 1 product.
Products include Mattermost Mattermost Mobile.
How do I fix CVE-2025-20630?
No fix has been published for CVE-2025-20630 yet. Limit exposure of the affected software until one is available.
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-2025-20630 being exploited?
There is no known exploitation of CVE-2025-20630 in the wild and no public exploit code.
Other vulnerabilities in Mattermost
Sources
Also known as GHSA-93w4-x8jh-j7m2.