CVE-2025-13821

MEDIUM

Mattermost 11.1.x-11.1.2/10.11.x-10.11.9/11.2.x-11.2.1 - Info Discl...

Title source: llm
STIX 2.1

Description

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to sanitize sensitive data in WebSocket messages which allows authenticated users to exfiltrate password hashes and MFA secrets via profile nickname updates or email verification events. Mattermost Advisory ID: MMSA-2025-00560

References (1)

Core 1
Core References
Various Sources vendor-advisory
https://mattermost.com/security-updates

Scores

CVSS v3 5.7
EPSS 0.0004
EPSS Percentile 13.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-200
Status published
Products (3)
mattermost/mattermost 0 - 8.0.0-20251210191531-cd17b61de41bGo
mattermost/mattermost-server 11.1.0Go
mattermost/mattermost_server 10.11.0 - 10.11.10
Published Feb 16, 2026
Tracked Since Feb 18, 2026