CVE-2026-6347

Published May 18, 2026

Last updated 7 days ago

Overview

Description
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to sanitize sensitive configuration fields in the Mattermost Calls plugin which allows an attacker with access to a support packet to obtain TURN server credentials via the plaintext values present in the exported plugin configuration.. Mattermost Advisory ID: MMSA-2026-00605
Source
responsibledisclosure@mattermost.com
NVD status
Analyzed
Products
mattermost_server

Risk scores

CVSS 3.1

Type
Secondary
Base score
7.6
Impact score
4.7
Exploitability score
2.3
Vector string
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:L
Severity
HIGH

Weaknesses

responsibledisclosure@mattermost.com
CWE-200

Social media

Hype score
Not currently trending

Configurations

References

Sources include official advisories and independent security research.