CVE-2026-2299

Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint

CVSS 4.2 MEDIUMEPSS 0.1%CWE-862

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.

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected products

Mattermost · Mattermost Google Drive Plugin

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References

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