What is CVE-2020-8292?

CVE-2020-8292 is a medium-severity vulnerability in Rocket.chat, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-01-26.

How severe is CVE-2020-8292?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2020-8292 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Rocket.chat

CVE-2020-8292

Rocket.Chat server before 3.9.0 is vulnerable to a self cross-site scripting (XSS) vulnerability via the drag & drop functionality in message boxes.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-01-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (58.3th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Rocket.chat
Rocket.chat Server — versions Fixed in 3.9.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

docs.rocket.chat/guides/security/security-updates (Vendor Advisory)
hackerone.com/reports/962902 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-8292?: CVE-2020-8292 is a medium-severity vulnerability in Rocket.chat, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-01-26.
How severe is CVE-2020-8292?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2020-8292 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.