Information Exposure

Overview Affected versions of this package are vulnerable to Information Exposure via the WebSocket component. An attacker can obtain sensitive information, including password hashes and MFA secrets, by triggering profile nickname updates or email verification events. Remediation Upgrade...

EUVD-2025-206981

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:...

GHSA-PP9J-PF5C-659X Mattermost fails to sanitize sensitive data in WebSocket messages

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:...

Mattermost fails to sanitize sensitive data in WebSocket messages

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:...

CVE-2025-13821

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:...

CVE-2025-13821

Mattermost servers of versions 10.11.x <= 10.11.9 , 11.1.x <= 11.1.2 , and 11.2.x

CVE-2025-13821 User profile update exposes password hash and MFA secrets

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:...

CVE-2025-13821 User profile update exposes password hash and MFA secrets

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:...

PT-2026-8338

Name of the Vulnerable Software and Affected Versions Mattermost versions 10.11.x through 10.11.9 Mattermost versions 11.1.x through 11.1.2 Mattermost versions 11.2.x through 11.2.1 Description The software does not properly sanitize sensitive data within WebSocket messages. This allows...

Mattermost allows system administrators to access password hashes and MFA secrets

Mattermost versions 10.11.x = 10.11.3, 10.5.x = 10.5.11, 10.12.x = 10.12.0 fail to sanitize user data which allows system administrators to access password hashes and MFA secrets via the POST /api/v4/users/userid/email/verify/member endpoint...

CVE-2025-11794

CVE-2025-11794 affects Mattermost Server versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, and 10.12.x

CVE-2025-11794 Password hash and MFA secret returned in user email verification endpoint

Mattermost versions 10.11.x = 10.11.3, 10.5.x = 10.5.11, 10.12.x = 10.12.0 fail to sanitize user data which allows system administrators to access password hashes and MFA secrets via the POST /api/v4/users/userid/email/verify/member endpoint...

Authentication flaw

Versions of the package github.com/greenpau/caddy-security before 1.0.42 are vulnerable to Insecure Randomness due to using an insecure random number generation library which could possibly be predicted via a brute-force search. Attackers could use the potentially predictable nonce value used for...

CVE-2024-21495

The CVE-2024-21495 entry concerns the Go package github.com/greenpau/caddy-security (versions before 1.0.42). Root cause: insecure randomness used in multiple contexts (OAuth nonce, MFA secrets, API key generation) due to an insecure RNG library, enabling potential replay or predictability attack...

CVE-2024-21495

Versions of the package github.com/greenpau/caddy-security before 1.0.42 are vulnerable to Insecure Randomness due to using an insecure random number generation library which could possibly be predicted via a brute-force search. Attackers could use the potentially predictable nonce value used for...

Insecure Randomness

Overview Affected versions of this package are vulnerable to Insecure Randomness due to using an insecure random number generation library which could possibly be predicted via a brute-force search. Attackers could use the potentially predictable nonce value used for authentication purposes in th...