CVE-2026-2299
Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint
CVSS Score
4.2
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-862 |
| Vendor | mattermost |
| Product | mattermost google drive plugin |
| Published | Jun 25, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
Mattermost / Mattermost Google Drive Plugin
0 ≤ 1.0.0
References
Credits
Lorenzo Gallegos