What’s Vulnerable › Vulnerabilities
CVE-2026-2299: Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-25 · updated 2026-10-25
- Weakness: CWE-862
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
- Mattermost Google Drive Plugin: before 1.1.0; 1.1.0-rc1, 1.1.0-rc2 — fixed in 1.1.0
How to fix
Upgrade to a fixed version: Mattermost Google Drive Plugin 1.1.0. Check the vendor advisory for mitigations.
References
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