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CVE-2026-47733— Rocket.Chat: Missing URL protocol sanitization in ImageElement allows javascript: URLs in markdown images

CVSS 4.4 · Medium EPSS 0.12% · P2

Affected Version Matrix 1

VendorProductVersion RangeStatus
RocketChatRocket.Chat< 8.5.0affected
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I. Basic Information for CVE-2026-47733

Vulnerability Information
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Vulnerability Title
Rocket.Chat: Missing URL protocol sanitization in ImageElement allows javascript: URLs in markdown images
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
RocketChatRocket.Chat < 8.5.0 -

II. Public POCs for CVE-2026-47733

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III. Intelligence Information for CVE-2026-47733

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Vendor Advisories for CVE-2026-47733 (1)

Same Patch Batch · RocketChat · 2026-06-24 · 12 CVEs total

CVE-2026-456889.1 CRITICALRocket.Chat: Pre-Auth NoSQL Injection in CAS Login Handler leading to Arbitrary CAS/SAML U
CVE-2026-456899.1 CRITICALRocket.Chat: Pre-Auth NoSQL Injection in OAuth2 Token Endpoint leading to Arbitrary User A
CVE-2026-456878.5 HIGHRocket.Chat: Authenticated Arbitrary Data Export Theft via Mass Assignment in sendFileMess
CVE-2026-557628.1 HIGHRocket.Chat: Any Authenticated User Can Permanently Deregister Workspace from Rocket.Chat
CVE-2026-557597.4 HIGHRocket.Chat: Apple Sign-In skips JWT claims validation, allowing expired and cross-audienc
CVE-2026-492786.7 MEDIUMRocket.Chat: Livechat Visitor Profile Disclosure Leaks Bearer Token and Enables Visitor Im
CVE-2026-45677Rocket.Chat: Lack of SAML Signature Check During Logout Could Lead To DoS
CVE-2026-45757Rocket.Chat: users.deactivateIdle` deactivates accounts without revoking existing login to
CVE-2026-49277Rocket.Chat: OAuth access and refresh tokens remain valid after account deactivation
CVE-2026-46423Rocket.Chat: SAML signature validation skipped when IdP certificate field is empty
CVE-2026-55666Rocket.Chat: Email Parameter Fallback Leads To Account Takeover Within Apple OAuth

IV. Related Vulnerabilities

Same product: Rocket.Chat
Same vendor: RocketChat
Same weakness: CWE-79

V. Comments for CVE-2026-47733

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