CVE-2026-6347
HighCVSS 7.6Exploitation Probability (EPSS)
Low risk35th percentile - higher than 35% of all known CVEs
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.
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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

