CVE-2023-35075: Mattermost

Medium severity, CVSS 5.4. EPSS: 0.4% chance of exploitation in the next 30 days.

Mattermost fails to use  innerText / textContent when setting the channel name in the webapp during autocomplete, allowing an attacker to inject HTML to a victim's page by create a channel name that is valid HTML. No XSS is possible though. 

Affected products

• Mattermost Mattermost: up to and including 7.8.12; from 8.0.0, up to and including 8.1.3

Published 2023-11-27. Last modified 2026-06-17.