EUVD-2026-42153
GHSA-qwgw-434q-whq6
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
PR:L required for upload access, UI:R mandatory for victim to open file, S:C reflects script executing outside the vulnerable component in victim browser; no availability impact applies.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
2DescriptionCVE.org
An HTML injection vulnerability in the file view endpoint of LiquidFiles v4.2.7 allows authenticated attackers to execute arbitrary JavaScript in the context of the victim's browser via the uploading of and user interaction with a crafted HTML file.
AnalysisAI
Stored Cross-Site Scripting in LiquidFiles v4.2.7 enables authenticated attackers to execute arbitrary JavaScript in a victim's browser by uploading a crafted HTML file to the file view endpoint. When any user with access opens the file through the LiquidFiles web interface, the embedded script executes in their browser context - enabling session theft, credential harvesting, or action-on-behalf-of-victim attacks. A public proof-of-concept exists per SSVC data, and referenced security research specifically documents a Content Security Policy bypass technique for this product, indicating the attack surface has been actively researched.
Technical ContextAI
LiquidFiles is a secure file transfer and sharing platform. The vulnerable component is the file view endpoint, which renders uploaded HTML files in the browser without adequate output encoding or content-type enforcement, constituting a CWE-79 (Improper Neutralization of Input During Web Page Generation) flaw in its stored XSS variant. Unlike reflected XSS, the payload persists server-side as an uploaded file and is triggered on subsequent victim visits - broadening the attack window. The CVSS scope change (S:C) indicates the injected script escapes the vulnerable application's security boundary to execute in the victim's browser context. Notably, the referenced security research (securing.pl) specifically addresses bypassing the application's Content Security Policy to achieve this XSS, suggesting LiquidFiles has CSP controls that are circumventable through techniques documented in the public writeup.
RemediationAI
Consult the LiquidFiles release notes at https://docs.liquidfiles.com/release_notes/version_4-2-x.html to identify a patched version in the 4.2.x series and upgrade immediately. No specific patched version number is confirmed from available input data, so verification against the vendor advisory is required before treating any upgrade as a complete fix. If immediate patching is not possible, restrict file upload permissions to the smallest set of trusted accounts necessary - this reduces attacker preconditions since PR:L is required. Avoid relying on Content Security Policy alone as a compensating control: the referenced security research (https://securing.pl/en/bypassing-csp-to-exploit-stored-xss-in-liquidfiles/) specifically documents a CSP bypass for this product, making CSP an unreliable standalone mitigation. Consider disabling HTML file preview rendering at the application or WAF level if that configuration is available, forcing HTML files to download rather than render in-browser.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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