PT-2026-52566 · Mattermost · Mattermost Google Drive Plugin

Lorenzo Gallegos · Published 2026-06-25 · Updated 2026-06-25 · CVE-2026-2299

NVD

CVSS v3.1

4.2

Medium

Base vector

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

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 channels and disclose private channel membership.

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-2299

Affected Products

Mattermost Google Drive Plugin

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-2299 · Security Note
• https://github.com/mattermost/mattermost-plugin-google-drive/releases/tag/v1.1.0 · Note