CVE-2025-20033

MEDIUM

Mattermost 9.11.0-9.11.5, 10.0.0-10.0.3, 10.1.0-10.1.3, 10.2.0 DoS via Custom Post Type Validation Bypass

Title source: llm

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.

References (1)

Core 1

Core References

Vendor Advisory

https://mattermost.com/security-updates

Scores

CVSS v3 4.3

EPSS 0.0059

EPSS Percentile 43.5%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-1287

Status published

Products (2)

mattermost/mattermost 9.11.0 - 9.11.16Go

mattermost/mattermost_server 9.11.0 - 9.11.6

Published Jan 09, 2025

Tracked Since Feb 18, 2026