What is CVE-2026-2299?

CVE-2026-2299 is a medium-severity vulnerability in Mattermost Google Drive Plugin, classified under Missing Authorization. CVSS score: 4.2/10. Published 2026-06-25.

How severe is CVE-2026-2299?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Auth bypass in Mattermost Google Drive Plugin

CVE-2026-2299

The Mattermost Google Drive plugin before version 1.1.0 fails to validate channel membership in the file creation endpoint, allowing authenticated users with a connected Google account to share Google Drive files to unauthorized private ch…

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N.

Affected products

Mattermost Google Drive Plugin — versions 0, 1.1.0

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

responsibledisclosure@mattermost.com

Frequently asked questions

What is CVE-2026-2299?: CVE-2026-2299 is a medium-severity vulnerability in Mattermost Google Drive Plugin, classified under Missing Authorization. CVSS score: 4.2/10. Published 2026-06-25.
How severe is CVE-2026-2299?: Medium severity. CVSS v3 base score is 4.2 out of 10.