EUVD-2026-42152
GHSA-w3vg-32vp-m7wp
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Network-delivered stored XSS requiring authenticated upload access (PR:L) and victim page view (UI:R); scope changes to victim context with low C and I impact.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
3DescriptionCVE.org
An authenticated stored cross-site scripting (XSS) vulnerability in the Upload File Shares API of LiquidFiles v4.2.7 allows attackers to execute arbitrary Javascript or HTML via injecting a crafted payload into the Name parameter.
AnalysisAI
Stored cross-site scripting in LiquidFiles v4.2.7 allows authenticated attackers to inject persistent malicious JavaScript or HTML via the Name parameter of the Upload File Shares API, executing in victims' browsers when they interact with the affected share. The scope-changed CVSS vector (S:C) confirms the payload executes outside the attacker's privilege context, enabling session hijacking, credential theft, or UI redress against other users. A security researcher published a write-up specifically documenting CSP bypass techniques to exploit this flaw, indicating the attack is non-trivial but achievable. No public exploit identified at time of analysis, and EPSS sits at 0.16% (5th percentile), suggesting low automated exploitation pressure.
Technical ContextAI
LiquidFiles is an enterprise secure file transfer and sharing platform. CWE-79 (Improper Neutralization of Input During Web Page Generation) identifies the root cause as insufficient output encoding or input validation on user-supplied data written into the HTML response. The vulnerable sink is the Name parameter in the Upload File Shares API endpoint - user-controlled input is stored server-side and later rendered in the browser DOM without adequate sanitization. The CVSS scope-change flag (S:C) reflects the classic stored XSS pattern where the attacker's payload executes in a different security principal's context (the victim's authenticated session). The external reference to a CSP bypass write-up at securing.pl implies the application has Content Security Policy headers, but a researcher identified a bypass route, which elevates the exploitability beyond a naive XSS. CPE data provided (cpe:2.3:a:n/a:n/a:*) is non-informative and does not supply additional product scoping.
RemediationAI
Upgrade LiquidFiles to a version beyond 4.2.7 by consulting the vendor release notes at https://docs.liquidfiles.com/release_notes/version_4-2-x.html for the specific patched build; an exact fix version is not independently confirmed from supplied data, so verify with the vendor before treating any specific version as safe. As a compensating control while patching, restrict access to the file-sharing upload functionality to the minimum required user population via role-based access controls, reducing the attacker pool. Organizations should also review CSP policies, as the referenced research at https://securing.pl/en/bypassing-csp-to-exploit-stored-xss-in-liquidfiles/ documents a bypass of existing CSP headers - tightening the CSP to eliminate the specific bypass vector described in that advisory is an additional defensive layer. Monitoring for anomalous JavaScript execution or unexpected external resource loads within the LiquidFiles interface can serve as a detection control.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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