CVE-2025-49222 – github.com/mattermost/mattermost-server

Package

Manager: go
Name: github.com/mattermost/mattermost-server
Vulnerable Version: >=10.8.0 <10.8.4 || >=10.5.0 <10.5.9 || >=9.11.0 <9.11.18 || >=10.9.0 <10.9.3 || =10.10.0 || >=10.10.0 <10.10.1

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

EPSS: 0.00037 pctl0.09932

Details

Mattermost Fails to Validate Remote Cluster Upload Sessions Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.9.x <= 10.9.2, 10.10.x <= 10.10.0 fail to validate upload types in remote cluster upload sessions which allows a system admin to upload non-attachment file types via shared channels that could potentially be placed in arbitrary filesystem directories.

Metadata

Created: 2025-08-21T09:30:21Z
Modified: 2025-08-29T20:58:14Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/08/GHSA-q453-638c-h4mr/GHSA-q453-638c-h4mr.json
CWE IDs: ["CWE-434"]
Alternative ID: GHSA-q453-638c-h4mr
Finding: F027
Auto approve: 1