CVE-2018-13879

5.4 mediumEPSS 0.6%

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.

Severity

CVSS 3.0

5.4 medium

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.6% chance of exploitation in the next 30 days; higher than 49% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2018-07-11
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

rocket.chat:rocket.chat

References

https://github.com/RocketChat/Rocket.Chat/issues/10795
https://github.com/RocketChat/Rocket.Chat/issues/10795

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