CVE-2026-2299

Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint

State: Published
Severity: 4.2 Medium
Published: Jun 25, 2026
Updated: Jun 26, 2026
Reserved: Feb 10, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	4.2 Medium	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N	Mattermost

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
Mattermost Google Drive PluginMattermost	1.0.0 and earlierAffected 1.1.0Not affected

References

https://github.com/mattermost/mattermost-plugin-google-drive/releases/tag/v1.1.0

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