What’s Vulnerable › Vulnerabilities
CVE-2023-1775: Unsanitized events sent over Websocket to regular users in a High Availability environment
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2023-03-31 · updated 2026-06-17
- Weakness: CWE-200
Description
When running in a High Availability configuration, Mattermost fails to sanitize some of the user_updated and post_deleted events broadcast to all users, leading to disclosure of sensitive information to some of the users with currently connected Websocket clients.
Affected products
- Mattermost: before 7.1.6; 7.7.1 — fixed in 7.1.6
How to fix
Upgrade to a fixed version: Mattermost 7.1.6. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2023-1775 or the next vulnerability affects your stack