CVE-2025-43734 Overview
CVE-2025-43734 is a reflected cross-site scripting (XSS) vulnerability affecting Liferay Portal and Liferay Digital Experience Platform (DXP). The flaw resides in the custom sort widget configuration, specifically the first display label field. A remote authenticated attacker can inject JavaScript code into this field, and the payload is reflected and executed by the clay button taglib when the page refreshes. The vulnerability is classified under [CWE-79]: Improper Neutralization of Input During Web Page Generation. Successful exploitation enables script execution in the context of another authenticated user's browser session.
Critical Impact
Authenticated attackers can execute arbitrary JavaScript in victim browsers, enabling session data theft, unauthorized actions, and phishing within the trusted Liferay interface.
Affected Products
- Liferay Portal 7.4.0 through 7.4.3.132
- Liferay DXP 2025.Q1.0–2025.Q1.10, 2024.Q4.0–2024.Q4.7, 2024.Q3.1–2024.Q3.13, 2024.Q2.1–2024.Q2.13, 2024.Q1.1–2024.Q1.16
- Liferay DXP 7.4 GA through update 92
Discovery Timeline
- 2025-08-12 - CVE-2025-43734 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-43734
Vulnerability Analysis
The vulnerability exists in the custom sort widget's configuration flow within Liferay Portal and DXP. When an authenticated user configures the widget, the first display label field accepts arbitrary text input. The application fails to properly neutralize HTML and JavaScript characters before passing the value to the clay button taglib for rendering. When the page refreshes, the taglib emits the stored label into the response markup without contextual output encoding.
This produces a reflected XSS condition executing in the browser of any user who views the reconfigured widget. Because the payload is rendered inside a legitimate Liferay page, the injected script inherits the origin and cookies of the current session.
Root Cause
The root cause is missing output encoding within the clay button taglib rendering path for the first display label value. Liferay's tag library assumes upstream sanitization of the label attribute, while the custom sort widget configuration handler accepts raw user input. This mismatch between producer and consumer trust boundaries results in a classic [CWE-79] reflected XSS.
Attack Vector
An authenticated attacker with permission to configure a custom sort widget submits a JavaScript payload in the first display label field. When a targeted user visits or refreshes the containing page, the payload executes in that user's browser. The attack requires user interaction (viewing the affected page) but no additional privileges beyond widget configuration access. See the Liferay CVE-2025-43734 advisory for vendor-provided technical details.
Detection Methods for CVE-2025-43734
Indicators of Compromise
- HTTP POST requests to Liferay widget configuration endpoints containing <script>, onerror=, onload=, or javascript: payloads in first display label parameters.
- Anomalous outbound requests from user browsers to attacker-controlled domains shortly after loading pages hosting custom sort widgets.
- Application logs showing custom sort widget configuration edits followed by widget page refreshes from different user sessions.
Detection Strategies
- Inspect Liferay portal access logs for widget configuration POST requests containing encoded or raw JavaScript event handlers.
- Deploy a web application firewall (WAF) rule set to identify script-like payloads submitted to Liferay portlet configuration endpoints.
- Correlate widget configuration changes with subsequent page views by other authenticated users for early identification of exploitation attempts.
Monitoring Recommendations
- Enable browser Content Security Policy (CSP) violation reporting to capture unexpected inline script execution on Liferay-served pages.
- Monitor Liferay audit logs for high-frequency widget configuration edits, especially by newly created or low-privilege accounts.
- Track anomalous session activity such as unexpected API calls or privilege changes originating from Liferay user sessions.
How to Mitigate CVE-2025-43734
Immediate Actions Required
- Apply the Liferay security update referenced in the vendor advisory for your specific Portal or DXP branch.
- Audit existing custom sort widget configurations across all sites for unexpected HTML or JavaScript content in the first display label field.
- Restrict widget configuration permissions to trusted administrators until patches are deployed.
Patch Information
Liferay has published fixed builds for the affected Portal and DXP release trains. Consult the Liferay CVE-2025-43734 advisory for the specific fix pack, service pack, or quarterly release that addresses this issue on your version.
Workarounds
- Enforce a strict Content Security Policy that disallows inline script execution on Liferay-rendered pages to blunt reflected XSS payloads.
- Remove or disable the custom sort widget on public-facing sites where it is not required.
- Revoke widget configuration privileges from non-administrative roles until the security update is applied.
# Example Content Security Policy header to mitigate reflected XSS
Content-Security-Policy: default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; report-uri /csp-report
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
