CVE-2026-96260

The Mattermost server is vulnerable to a denial of service because it fails to enforce a request body size limit during CSRF validation of plugin requests. This flaw allows an authenticated user to exhaust server memory by sending a large request body to a plugin endpoint. Affected versions inclu...

CVE-2026-96260 Mattermost server missing request body size limit on plugin routes allows denial of service by an authenticated user

Mattermost versions 11.9.x = 11.9.1, 11.8.x = 11.8.5, 11.7.x = 11.7.10, 11.10.x = 11.10.1 fail to enforce a request body size limit during CSRF validation of plugin requests which allows an authenticated user to exhaust server memory and cause a denial of service via a large request body sent to ...

Duplicate of GHSA-m77f-652q-wwp4

Duplicate advisory This advisory is a duplicate of GHSA-m77f-652q-wwp4. This link is maintained to preserve external references. Original Description ::fromrequest would not, by default, set a limit for the size of the request body. That meant if a malicious peer would send a very large or infini...