CVE-2018-13878

Severity: medium (CVSS 6.1 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-07-11 · updated 2026-06-17
Weakness: CWE-79

Description

An XSS issue was discovered in packages/rocketchat-mentions/Mentions.js in Rocket.Chat before 0.65. The real name of a username is displayed unescaped when the user is mentioned (using the @ symbol) in a channel or private chat. Consequently, it is possible to exfiltrate the secret token of every user and also admins in the channel.

Affected products

Rocket.Chat: before 0.65 — fixed in 0.65

How to fix

Upgrade to a fixed version: Rocket.Chat 0.65. Check the vendor advisory for mitigations.

References

https://github.com/RocketChat/Rocket.Chat/pull/10793
https://github.com/RocketChat/Rocket.Chat/pull/10793

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