Description

Mattermost versions 10.11.x <= 10.11.8 fail to validate input size before processing hashtags which allows an authenticated attacker to exhaust CPU resources via a single HTTP request containing a post with thousands space-separated tokens

Related CPE's

a

mattermost

mattermost_server

Vulnerable

References

https://mattermost.com/security-updates

Vendor Advisory

Weaknesses

[email protected]

Secondary
CWE-407

[email protected]

Primary
CWE-770

CVSS impact metrics

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

3.1 · Low

Information

Source identifier

[email protected]

Vulnerability status

Analyzed

Published

2026-01-16T09:16:01.460Z

4 days ago

Last modified

2026-01-20T15:11:19.127Z

13 hours ago