CVE-2025-43829 in Liferay
Summary
by MITRE • 10/08/2025
Stored cross-site scripting (XSS) vulnerability in diagram type products in Commerce in Liferay Portal 7.4.3.18 through 7.4.3.111, and Liferay DXP 2023.Q4.0 through 2023.Q4.5, 2023.Q3.1 through 2023.Q3.8, and 7.4 update 18 through update 92 allows remote attackers to inject arbitrary web script or HTML via a crafted payload injected into a SVG file.
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Analysis
by VulDB Data Team • 12/16/2025
This stored cross-site scripting vulnerability exists within the diagram type product functionality of Liferay Portal and Liferay DXP platforms, specifically affecting versions ranging from 7.4.3.18 through 7.4.3.111 and various DXP quarterly releases from 2023.Q3.1 to 2023.Q4.5. The flaw permits remote attackers to execute malicious scripts by injecting crafted payloads into SVG files that are subsequently processed and displayed within the application interface. The vulnerability stems from insufficient input validation and output encoding mechanisms when handling SVG content, creating an attack vector that allows persistent script execution across user sessions. This represents a critical security weakness in web application frameworks where user-supplied content is rendered without adequate sanitization, particularly affecting diagram visualization components that process vector graphics.
The technical implementation of this vulnerability involves the improper handling of SVG file uploads within the diagram product modules, where the application fails to adequately sanitize or escape user-provided SVG content before storing and rendering it. Attackers can craft malicious SVG files containing embedded script tags or event handlers that execute when the diagram is displayed to other users. The stored nature of this vulnerability means that once a malicious SVG is uploaded and processed, it remains persistent in the system and affects all users who view the affected diagrams, making it particularly dangerous for collaborative environments where multiple users interact with shared content. This flaw directly maps to CWE-79, which describes cross-site scripting vulnerabilities resulting from insufficient input validation and output encoding in web applications.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform session hijacking, steal sensitive user data, manipulate application functionality, or redirect users to malicious websites. In enterprise environments using Liferay Portal, this vulnerability could compromise the security of business-critical diagramming applications where users frequently upload and share visual content. The persistent nature of stored XSS means that attackers can maintain access to compromised systems over extended periods, potentially exfiltrating confidential information or establishing backdoors through the executed scripts. This vulnerability also aligns with ATT&CK technique T1566, which covers the use of malicious files for initial access, and T1059, covering the execution of malicious code through web scripting.
Organizations affected by this vulnerability should implement immediate mitigations including enhanced input validation for SVG file uploads, implementing strict content security policies, and applying the latest security patches from Liferay. The recommended approach involves configuring the application to sanitize SVG content using dedicated libraries that remove or escape dangerous elements and attributes, while also implementing proper output encoding for all diagram rendering processes. Network monitoring should be enhanced to detect suspicious SVG file uploads, and access controls should be reviewed to limit who can upload diagram content. Additionally, implementing web application firewalls with signature-based detection for known XSS attack patterns can provide additional defense layers. Regular security assessments should be conducted to verify that SVG handling processes properly validate and sanitize all user-supplied content, ensuring that the vulnerability cannot be exploited through other attack vectors or components within the application ecosystem.