CVE-2026-2299

MEDIUM

Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint

Title source: cna

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.

References (1)

Core 1

Core References

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

Scores

CVSS v3 4.2

EPSS 0.0012

EPSS Percentile 2.1%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-862

Status published

Products (2)

Mattermost/Mattermost Google Drive Plugin < 1.0.0

Mattermost/Mattermost Google Drive Plugin 1.1.0

Published Jun 25, 2026

Tracked Since Jun 26, 2026