PT-2026-41646 · Mattermost · Mattermost Plugins

Eahmed · Published 2026-05-18 · Updated 2026-05-18 · CVE-2026-6341

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions Mattermost Plugins versions prior to 11.5

Description Insufficient API-level checks regarding group permissions allow a user who is a member of multiple groups to create issues or attach comments to a locked group through direct API requests.

Recommendations Update to a version newer than 11.5.

Fix

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

CVE-2026-6341

Affected Products

Mattermost Plugins

References · 4

• https://mattermost.com/security-updates · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-6341 · Security Note
• https://twitter.com/CVEarity/status/2056409877849972853 · Twitter Post
• https://t.me/CVEtracker/54107 · Telegram Post