CVE-2025-43829 is a stored cross-site scripting (XSS) vulnerability categorized under CWE-79 that impacts Liferay Portal and Liferay DXP products, particularly versions 7.4.3.18 through 7.4.3.111 and 2023.Q3 to 2023.Q4 releases as specified. The vulnerability arises from insufficient sanitization of SVG files used in diagram-type products within the Commerce module, allowing attackers to embed malicious JavaScript or HTML payloads. When these crafted SVG files are uploaded and subsequently rendered by the portal, the embedded scripts execute in the context of the victim's browser. This can lead to theft of session cookies, unauthorized actions on behalf of users, or redirection to malicious sites. The attack vector is remote and network accessible, requiring no authentication (PR:L indicates low privileges, but the CVSS vector shows PR:L, meaning some privileges are needed, but the description states remote attackers can inject payloads, so likely low privileges). User interaction is necessary to trigger the payload, such as viewing the affected SVG content. The vulnerability impacts confidentiality and integrity moderately, with limited impact on availability. No known exploits have been reported in the wild, and no official patches have been linked at the time of publication. The medium CVSS score (4.8) reflects the moderate risk posed by this vulnerability, balancing ease of exploitation and impact. The vulnerability is significant for organizations relying on Liferay Portal for commerce and content management, especially where SVG files are accepted as input.

For European organizations, the impact of CVE-2025-43829 can be significant in sectors relying on Liferay Portal for e-commerce and content delivery, such as retail, finance, and public sector websites. Successful exploitation could lead to session hijacking, unauthorized actions, or phishing attacks targeting employees or customers, potentially resulting in data breaches or reputational damage. The stored nature of the XSS means malicious scripts persist on the server, increasing the risk of widespread compromise if multiple users access the infected content. Given Liferay's popularity among European enterprises for digital experience platforms, the vulnerability could affect a broad range of organizations. However, the requirement for user interaction and some privilege level reduces the likelihood of mass exploitation. Still, targeted attacks against high-value organizations or critical infrastructure using Liferay could leverage this vulnerability to gain footholds or escalate privileges. The absence of known exploits currently provides a window for proactive mitigation.

Organizations should immediately audit their Liferay Portal and DXP deployments to identify affected versions and restrict SVG file uploads where possible. Implement strict input validation and sanitization for SVG files, ensuring that any embedded scripts or potentially dangerous elements are removed before processing or rendering. Employ Content Security Policy (CSP) headers to restrict script execution origins and reduce the impact of any injected scripts. Monitor web server and application logs for unusual SVG upload activity or anomalous user behavior. Where feasible, upgrade to the latest Liferay versions once patches addressing this vulnerability are released. In the interim, consider disabling or limiting the Commerce diagram-type product features that accept SVG inputs. Educate users about the risks of interacting with untrusted content and enforce least privilege principles to minimize the impact of potential exploitation. Regularly review and update web application firewalls (WAFs) to detect and block malicious payloads targeting this vulnerability.