CVE-2026-47733: Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.0, the ImageElement component in packages/gazzodown renders…

PriorityP424medium4.4CVSS 3.1

AVNACHPRLUIRSCCLILAN

EPSS

0.12%

2.0th percentile

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.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
rocketchat	rocket.chat	< 8.5.0	8.5.0

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