CVE-2019-17220

MEDIUM

Rocket.Chat < 2.1.0 - Cross-Site Scripting via Markdown Image URL

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2019-17220. PoCs published by 3H34N.

AI-analyzed exploit summary This PoC demonstrates a cross-site scripting (XSS) vulnerability in Rocket.Chat versions prior to 2.1.0. The exploit involves sending a malicious message containing a crafted image link that, when viewed by the target, exfiltrates the user's token to an attacker-controlled server.

Description

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

Exploits (1)

exploitdb WORKING POC
by 3H34N · textwebappslinux
https://www.exploit-db.com/exploits/47537

This PoC demonstrates a cross-site scripting (XSS) vulnerability in Rocket.Chat versions prior to 2.1.0. The exploit involves sending a malicious message containing a crafted image link that, when viewed by the target, exfiltrates the user's token to an attacker-controlled server.

Classification
Working Poc 90%
Attack Type
Xss
Complexity
Trivial
Reliability
Reliable
Target: Rocket.Chat < 2.1.0
Auth required
Prerequisites: Access to a Rocket.Chat instance · Ability to send messages to a target user · Control over a web server to host the malicious PHP script
MITRE ATT&CK
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (4)

Core 4
Core References
Exploit, Third Party Advisory x_refsource_misc
https://www.nezami.me/
Release Notes, Third Party Advisory x_refsource_misc
https://github.com/RocketChat/Rocket.Chat/releases
Patch, Third Party Advisory x_refsource_misc
https://github.com/RocketChat/Rocket.Chat/commits/develop

Scores

CVSS v3 6.1
EPSS 0.0402
EPSS Percentile 89.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Details

CWE
CWE-79
Status published
Products (1)
rocket.chat/rocket.chat < 2.1.0
Published Oct 21, 2019
Tracked Since Feb 18, 2026