CVE-2026-28741

MEDIUM

CSRF Protection Bypass Allows Updating a User's Authentication Method

Title source: cna

Description

Mattermost versions 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to validate CSRF tokens on an authentication endpoint which allows an attacker to update a user's authentication method via a CSRF attack by tricking a user into visiting a malicious page. Mattermost Advisory ID: MMSA-2026-00625

References (1)

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

Scores

CVSS v3 6.8

EPSS 0.0002

EPSS Percentile 4.1%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-352

Status published

Products (9)

Mattermost/Mattermost 10.11.0 - 10.11.12

Mattermost/Mattermost 10.11.13

Mattermost/Mattermost 11.3.0 - 11.3.2

Mattermost/Mattermost 11.3.3

Mattermost/Mattermost 11.4.0 - 11.4.2

Mattermost/Mattermost 11.4.3

Mattermost/Mattermost 11.5.0

Mattermost/Mattermost 11.5.1

mattermost/mattermost_server 10.11.0 - 10.11.13

Published Apr 15, 2026

Tracked Since Apr 15, 2026