CVE-2025-49875 is a Stored Cross-Site Scripting (XSS) vulnerability affecting the IfSo Dynamic Content Personalization plugin, versions up to 1.9.3.1. This vulnerability arises due to improper neutralization of user-supplied input during web page generation, classified under CWE-79. Specifically, the plugin fails to adequately sanitize or encode input that is later embedded into dynamically generated web pages, allowing malicious actors to inject and store arbitrary JavaScript code. When other users or administrators access the affected pages, the malicious script executes in their browsers within the context of the vulnerable site. The CVSS v3.1 base score is 6.5 (medium severity), with the vector indicating network attack vector (AV:N), low attack complexity (AC:L), requiring privileges (PR:L), user interaction (UI:R), scope changed (S:C), and low impact on confidentiality, integrity, and availability (C:L/I:L/A:L). The vulnerability requires an attacker to have some level of authenticated access to the system (PR:L) and to trick a user into interacting with the malicious payload (UI:R). The scope change (S:C) suggests that the vulnerability can affect resources beyond the initially vulnerable component, potentially impacting the entire web application or user session. No public exploits are currently known, and no patches have been linked yet. The vulnerability was published on June 17, 2025, and was reserved on June 11, 2025. The affected product is a popular WordPress plugin used for dynamic content personalization, which is often deployed on marketing, e-commerce, and corporate websites to tailor user experiences based on visitor attributes or behaviors.

For European organizations, this vulnerability poses a moderate risk primarily to the confidentiality and integrity of user sessions and data. Exploitation could lead to session hijacking, theft of sensitive information such as cookies or credentials, and unauthorized actions performed on behalf of legitimate users. Given that the vulnerability requires authenticated access and user interaction, the attack surface is somewhat limited but still significant for organizations with many users or administrators who manage content. The scope change indicates that the impact could extend beyond the plugin itself, potentially compromising other parts of the web application or user accounts. This could affect customer trust, lead to data breaches under GDPR regulations, and cause reputational damage. Organizations in sectors with high web presence such as retail, finance, and public services are particularly at risk. Additionally, if exploited in a targeted manner, attackers could leverage this vulnerability for phishing campaigns or to deliver secondary payloads such as malware or ransomware.

1. Immediate mitigation should include restricting plugin access to only trusted and necessary users to minimize the risk of authenticated attackers injecting malicious content. 2. Implement strict input validation and output encoding on all user-supplied data within the plugin, ensuring that any dynamic content is properly sanitized before rendering. 3. Monitor and audit user-generated content and plugin configurations regularly for suspicious or unexpected scripts or HTML. 4. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. 5. Limit the use of the plugin to only essential pages and consider disabling or removing it if not critical. 6. Stay alert for official patches or updates from the vendor and apply them promptly once available. 7. Educate administrators and users about the risks of interacting with untrusted content and the importance of cautious behavior when managing dynamic content. 8. Use web application firewalls (WAFs) with rules tuned to detect and block XSS payloads targeting this plugin. 9. Conduct regular security assessments and penetration tests focusing on dynamic content personalization features.