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CVE-2026-47733

MEDIUM
4.4
CVSS 3.1
Description
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 <a href> and <img src> 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.

Metadata

CVE ID
CVE-2026-47733
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-05-19 22:16 UTC
Published
2026-06-24 20:51 UTC
Last updated
2026-06-24 20:51 UTC
Primary CWE
CWE-79
CWE-79: Improper Neutralization of Input During Web Page Gen…
Vendor / Product
RocketChat / Rocket.Chat
Sources
cve.org  ·  NVD

Severity & Metrics

4.4 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
Affected products (1)
VendorProductPlatformVersions
RocketChat Rocket.Chat — < 8.5.0
Weakness (CWE)
CWESourceDescription
CWE-79 cna CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS scores (1)
ScoreSeverityVersionSourceVector
4.4 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
References (1)
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