CVE Catalog

CVE-2026-6347

High
Published: Translated: NVD NIST

Summary

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, and 11.4.x <= 11.4.3 fail to sanitize sensitive configuration fields in the Mattermost Calls plugin. This allows an attacker with access to a support packet to obtain TURN server credentials via the plaintext values present in the exported plugin configuration.

Risk Assessment

Organizations may be exposed to unauthorized access to sensitive data, potentially leading to serious security incidents. Disclosure of TURN server credentials could allow attackers to take control of communications.

Recommendation

It is recommended to update Mattermost to the latest version to mitigate this vulnerability. Additionally, conducting an audit of plugin configurations and security measures is advised to minimize the risk of data leakage.

Related vulnerabilities

Original NVD description (English source)

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

Vulnerability data from NVD (NIST) · CISA KEV · EPSS