CVE-2025-21088

MEDIUM

Mattermost <10.2.0-10.1.3 - Code Injection

Title source: llm

Description

Mattermost versions 10.2.x <= 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 the style of proto supplied to an action's style in post.props.attachments, which allows an attacker to crash the frontend via crafted malicious input.

References (1)

[Vendor Advisory] https://mattermost.com/security-updates

Scores

CVSS v3 6.5

EPSS 0.0018

EPSS Percentile 38.9%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-704

Status published

Products (3)

mattermost/mattermost 10.2.0 - 10.2.1Go

mattermost/mattermost_server 10.2.0

mattermost/mattermost_server 9.11.0 - 9.11.6

Published Jan 15, 2025

Tracked Since Feb 18, 2026