4.2
Medium
CVE-2026-2299 The Mattermost Google Drive plugin before version 1.1.0 fails to validate channel membership in the file creation…
Description
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Mattermost Google Drive Plugin 1.1 | earliest → < 1.1.0 | 1.1.0 |
| Mattermost Google Drive Plugin 1.0 | earliest → 1.0.0 | No fix stated |