What is CVE-2025-0476?

CVE-2025-0476 is a medium-severity vulnerability in Mattermost, classified under CWE-1287. CVSS score: 4.3/10. Published 2025-01-16.

How severe is CVE-2025-0476?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Mattermost

CVE-2025-0476

Mattermost Mobile Apps versions <=2.22.0 fail to properly handle specially crafted attachment names, which allows an attacker to crash the mobile app for any user who opened a channel containing the specially crafted attachment

Published 2025-01-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.004 (27.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

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

Affected products

Mattermost — versions 0, 2.23.0
Mattermost Mobile

Weakness classification (CWE)

CWE-1287

References

mattermost.com/security-updates (Vendor Advisory)

Frequently asked questions

What is CVE-2025-0476?: CVE-2025-0476 is a medium-severity vulnerability in Mattermost, classified under CWE-1287. CVSS score: 4.3/10. Published 2025-01-16.
How severe is CVE-2025-0476?: Medium severity. CVSS v3 base score is 4.3 out of 10.