What is CVE-2025-64641?

CVE-2025-64641 is a medium-severity vulnerability in Mattermost, classified under Incorrect Authorization. CVSS score: 4.1/10. Published 2025-12-24.

How severe is CVE-2025-64641?

Medium severity. CVSS v3 base score is 4.1 out of 10.

Auth bypass in Mattermost

CVE-2025-64641

Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fail to verify that post actions invoking /share-issue-publicly were created by the Jira plugin which allowed a malicious Mattermost user to exfiltrate Jira tickets when victim users interacted with affected posts

Vulnerability class: Broken Access Control

EPSS: 0.001 (4.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N.

Affected products

Mattermost — versions 11.1.0, 11.0.0, 10.12.0
Mattermost Mattermost_server

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

responsibledisclosure@mattermost.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2025-64641?: CVE-2025-64641 is a medium-severity vulnerability in Mattermost, classified under Incorrect Authorization. CVSS score: 4.1/10. Published 2025-12-24.
How severe is CVE-2025-64641?: Medium severity. CVSS v3 base score is 4.1 out of 10.