CVE-2026-2299

Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint

Published Jun 25, 2026 CVSS 3.1 · 4.2 Medium EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

Update Mattermost Google Drive plugin to version 1.1.0 or higher.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Mattermost google Drive
CPEs cpe:2.3:a:mattermost:google_drive:*:*:*:*:*:mattermost:*:*
cpe:2.3:a:mattermost:google_drive:1.1.0:rc1:*:*:*:mattermost:*:*
cpe:2.3:a:mattermost:google_drive:1.1.0:rc2:*:*:*:mattermost:*:*
Vendors & Products Mattermost google Drive
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost Google Drive Plugin
Vendors & Products Mattermost
Mattermost mattermost Google Drive Plugin
Type Values Removed Values Added
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.
Title Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint
Weaknesses CWE-862
References
Metrics cvssV3_1

{'score': 4.2, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Jun 26, 2026, 2:05 PM
Reserved
Feb 10, 2026, 4:46 PM
Status
Analyzed
Published
Jun 25, 2026, 8:17 PM
Modified
Oct 25, 2026, 10:10 PM