CVE-2025-64641

MEDIUM

Mattermost Server < 10.11.8 - Incorrect Authorization

Title source: rule

Description

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

References (1)

[Vendor Advisory] https://mattermost.com/security-updates

Scores

CVSS v3 4.1

EPSS 0.0004

EPSS Percentile 10.3%

Attack Vector NETWORK

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

Classification

CWE

CWE-863

Status published

Affected Products (3)

mattermost/mattermost_server < 10.11.8

mattermost/mattermost < 8.0.0-20251121122154-b57c297c6d7Go

mattermost/mattermost-server < 10.11.8Go

Timeline

Published Dec 24, 2025

Tracked Since Feb 18, 2026