Mattermost GMDrive Plugin <1.1.0 Authenticated File Share Disclosure
CVE-2026-2299 Published on June 25, 2026
Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint
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.
Vulnerability Analysis
CVE-2026-2299 can be exploited with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is an AuthZ Vulnerability?
The software does not perform an authorization check when an actor attempts to access a resource or perform an action.
CVE-2026-2299 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-2299
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Affected Versions
Mattermost Google Drive Plugin:- Before and including 1.0.0 is affected.
- Version 1.1.0 is unaffected.