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

Published 2026-01-16 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.004 (26.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000

Affected products

Mattermost — versions 10.11.0, 11.2.0, 10.11.9
Mattermost Server

Weakness classification (CWE)

References

mattermost.com/security-updates (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.