CVE-2021-22886

MEDIUM

Rocket.Chat < 3.8.8, < 3.9.7, < 3.10.5, < 3.11 - Stored Cross-Site Scripting via Nested Markdown Tags

Title source: llm
STIX 2.1

Description

Rocket.Chat before 3.11, 3.10.5, 3.9.7, 3.8.8 is vulnerable to persistent cross-site scripting (XSS) using nested markdown tags allowing a remote attacker to inject arbitrary JavaScript in a message. This flaw leads to arbitrary file read and RCE on Rocket.Chat desktop app.

References (3)

Core 3
Core References
Third Party Advisory x_refsource_misc
https://hackerone.com/reports/1014459
Patch, Third Party Advisory x_refsource_misc
https://github.com/RocketChat/Rocket.Chat/pull/20430

Scores

CVSS v3 6.1
EPSS 0.0170
EPSS Percentile 74.4%
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 (2)
rocket.chat/rocket.chat 3.11.0 rc0 (8 CPE variants)
rocket.chat/rocket.chat < 3.8.8
Published Mar 26, 2021
Tracked Since Feb 18, 2026