CVE-2025-43737 in Liferay
Summary
by MITRE • 08/19/2025
A reflected cross-site scripting (XSS) vulnerability in the Liferay Portal 7.4.3.132, and Liferay DXP 2025.Q2.0 through 2025.Q2.8 and 2025.Q1.0 through 2025.Q1.15 allows a remote authenticated user to inject JavaScript code via _com_liferay_journal_web_portlet_JournalPortlet_backURL parameter.
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Analysis
by VulDB Data Team • 12/15/2025
This reflected cross-site scripting vulnerability exists within the Liferay Portal and Liferay DXP platforms, specifically affecting versions through 2025.Q2.8 and 2025.Q1.15. The flaw manifests when a remote authenticated user manipulates the _com_liferay_journal_web_portlet_JournalPortlet_backURL parameter, enabling injection of malicious JavaScript code into the application's response. The vulnerability stems from insufficient input validation and output encoding mechanisms that fail to properly sanitize user-supplied parameters before incorporating them into web responses. This allows attackers to execute arbitrary scripts in the context of a victim's browser session, potentially leading to unauthorized access, data theft, or session hijacking.
The technical implementation of this vulnerability follows the standard reflected XSS pattern where user input flows directly from the request parameter to the response without adequate sanitization. The backURL parameter typically serves as a redirect mechanism after form submissions or navigation operations, making it a prime target for attackers seeking to redirect users to malicious sites or inject persistent scripts. The vulnerability's classification aligns with CWE-79 which defines Cross-Site Scripting as a weakness where untrusted data is incorporated into web page content without proper validation or encoding. This weakness directly enables the execution of malicious scripts in the victim's browser context, compromising the integrity of the web application and user sessions.
The operational impact of this vulnerability extends beyond simple script injection, as it enables attackers to exploit authenticated user sessions for unauthorized actions. An attacker could craft malicious URLs that, when clicked by an authenticated user, would execute scripts to steal session cookies, modify user preferences, or redirect to phishing sites. The reflected nature of the vulnerability means that the attack payload is delivered through a single request rather than requiring persistent storage, making it particularly dangerous for targeted attacks. This vulnerability particularly affects organizations using Liferay Portal or DXP platforms, where the attack vector could be exploited through social engineering campaigns targeting authenticated users or through compromised accounts.
Mitigation strategies should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application's data flow. Organizations should apply the latest security patches and updates provided by Liferay to address this vulnerability, while also implementing proper parameter sanitization for all user-supplied inputs. The implementation of Content Security Policy headers can provide additional protection against script execution, though this should complement rather than replace proper input validation. Security teams should also conduct regular vulnerability assessments and penetration testing to identify similar patterns in other application components. The ATT&CK framework categorizes this vulnerability under T1566 - Phishing and T1059 - Command and Scripting Interpreter, highlighting the attack vectors that can be exploited through such XSS flaws. Organizations should also consider implementing Web Application Firewalls and monitoring for suspicious parameter values to detect potential exploitation attempts.