CVE-2025-20033
MEDIUM4.3EPSS 0.15%Mattermost Improper Validation of Specified Type of Input vulnerability
Published: 1/9/2025Modified: 2/4/2026
Description
Mattermost versions 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post types, which allows attackers to deny service to users with the sysconsole_read_plugins permission via creating a post with the custom_pl_notification type and specific props.
Affected packages (5)
- Go/github.com/mattermost/mattermost-server>= 10.0.0+incompatible, < 10.0.4+incompatible, >= 10.1.0+incompatible, < 10.1.4+incompatible, >= 10.2.0+incompatible, < 10.2.1+incompatible
- Go/github.com/mattermost/mattermost-server/v5from 0
- Go/github.com/mattermost/mattermost-server/v6from 0
- Go/github.com/mattermost/mattermost/server/v8>= 9.11.0, < 9.11.16
- Go/github.com/mattermost/mattermost/server/v8from 0, < 8.0.0-20250102081831-64c566a8280b
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |