What is CVE-2025-14822?

CVE-2025-14822 is a low-severity vulnerability in Mattermost, classified under Inefficient Algorithmic Complexity. CVSS score: 3.1/10. Published 2026-01-16.

How severe is CVE-2025-14822?

Low severity. CVSS v3 base score is 3.1 out of 10.

Resource exhaustion in Mattermost

CVE-2025-14822

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

EPSS: 0.003 (23.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L.

Affected products

Mattermost — versions 10.11.0, 11.2.0, 10.11.9
Mattermost Mattermost_server

Weakness classification (CWE)

CWE-407 — Inefficient Algorithmic Complexity
CWE-770 — Allocation of Resources Without Limits or Throttling

References

responsibledisclosure@mattermost.com (Vendor Advisory)

Frequently asked questions

What is CVE-2025-14822?: CVE-2025-14822 is a low-severity vulnerability in Mattermost, classified under Inefficient Algorithmic Complexity. CVSS score: 3.1/10. Published 2026-01-16.
How severe is CVE-2025-14822?: Low severity. CVSS v3 base score is 3.1 out of 10.