What is CVE-2022-21830?

CVE-2022-21830 is a medium-severity vulnerability in Rocket.chat Livechat, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-04-01.

How severe is CVE-2022-21830?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Rocket.chat Livechat

CVE-2022-21830

A blind self XSS vulnerability exists in RocketChat LiveChat <v1.9 that could allow an attacker to trick a victim pasting malicious code in their chat instance.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-04-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (54.0th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Rocket.chat Livechat
Rocket.chat Livechat — versions Fixed in v1.9

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

hackerone.com/reports/1091118 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2022-21830?: CVE-2022-21830 is a medium-severity vulnerability in Rocket.chat Livechat, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-04-01.
How severe is CVE-2022-21830?: Medium severity. CVSS v3 base score is 6.1 out of 10.