PT-2026-52097 · Rocket.Chat · Rocket.Chat

Published 2026-06-24 · Updated 2026-06-24 · CVE-2026-47733

Mitre

CVSS v3.1

4.4

Medium

Base vector

AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N

Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.0, the ImageElement component in packages/gazzodown renders user-controlled src values directly into and attributes without protocol sanitization. Unlike the analogous LinkSpan component — which uses sanitizeUrl to block javascript:, data:, and vbscript: protocols — ImageElement passes the raw URL through unchanged. An authenticated user can post a markdown image with a javascript: URL that, if clicked on an older browser, would execute arbitrary JavaScript in the viewer's session. This vulnerability is fixed in 8.5.0.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-47733

Affected Products

Rocket.Chat

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-47733 · Security Note
• https://github.com/RocketChat/Rocket.Chat/security/advisories/GHSA-vvrf-fq54-q4pr · Note