Rocket.Chat before 2.1.0 allows XSS via a URL on a ![title] line.

published 2019-10-21 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-7640

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 4.0%; EPSS 4.0% chance of exploitation in 30 days, percentile 90%
public exploits: 1; Exploit-DB

Patch / fix

fixed in 1 links 1

rocket.chat rocket.chat 2.1.0

github.com/RocketChat/Rocket.Chat/commits/develop advisory

Timeline

2019-10-21 Published
2019-10-23 First public exploit (EDB-47537)

Exploit prediction

4.02% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

EDB-47537 Rocket.Chat 2.1.0 - Cross-Site Scripting webapps, 2019-10-23
nezami.me https://www.nezami.me/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /RocketChat/Rocket.Chat/commits/develop
patch, third-party-advisory
nezami.me /
exploit, third-party-advisory
github.com /RocketChat/Rocket.Chat/releases
release-notes, third-party-advisory
packetstormsecurity.com /files/154944/Rocket.Chat-2.1.0-Cross-Site-Scripting.html

Sources

CVE List CVE-2019-17220
NVD CVE-2019-17220

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary