CVE-2018-13879: Rocket.chat

Medium severity, CVSS 5.4. EPSS: 0.6% chance of exploitation in the next 30 days.

A reflected XSS issue was discovered in the registration form in Rocket.Chat before 0.66. When one creates an account, the next step will ask for a username. This field will not save HTML control characters but an error will be displayed that shows the attempted username unescaped via packages/rocketchat-ui-login/client/username/username.js in packages/rocketchat-ui-login/client/username/username.html.

Affected products

• Rocket.chat Rocket.chat: before 0.66 (fixed in 0.66)

Published 2018-07-11. Last modified 2026-06-17.