CVE-2025-13767: mattermost server from 10.11.0 (inclusive), before 10.11.8 (exclusive), from 10.12.0 (inclusive), before 10.12.4…

Affected technology

mattermost server · from 10.11.0 (inclusive), before 10.11.8 (exclusive)
mattermost

mattermost server · from 10.12.0 (inclusive), before 10.12.4 (exclusive)
mattermost

mattermost server · from 11.0.0 (inclusive), before 11.0.6 (exclusive)
mattermost

mattermost server · from 11.1.0 (inclusive), before 11.1.1 (exclusive)
mattermost

Mattermost · 11.1.0 through 11.1.0, 11.0.0 through 11.0.5, 10.12.0 through 10.12.3, 10.11.0 through 10.11.7
Mattermost

Description’s affected range: versions 11.1.x <= 11.1.0

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · Low privileges required · No user interaction required

What an attacker can do

The source says 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 fails to validate user channel membership when attaching Mattermost posts as comments to Jira issues, which allows an authenticated attacker with access to the Jira plugin to read post content and attachments from channels they do not have access to. Vendor/CNA’s CVSS 3.1 assessment (base score 4.3/10) rates confidentiality impact as low; integrity and availability impact as none.