CVE-2026-2299

EUVD-2026-39540
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
4.2 MEDIUM
NETWORK
HIGH
LOW
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 2.1%
Affected Products (NVD)
VendorProductVersion
mattermostgoogle_drive
𝑥
< 1.1.0
mattermostgoogle_drive
1.1.0:rc1
mattermostgoogle_drive
1.1.0:rc2
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/mattermost/mattermost-plugin-google-drive/releases/tag/v1.1.0