CVE-2025-62124 is a stored Cross-site Scripting (XSS) vulnerability identified in the Soli WP Post Signature WordPress plugin, affecting versions up to 0.4.1. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, specifically within the plugin's handling of post signatures. This flaw allows an attacker with high privileges to inject malicious JavaScript code that is stored persistently and executed in the context of users visiting the affected pages. The CVSS 3.1 vector (AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L) indicates that the attack can be performed remotely over the network with low attack complexity but requires high privileges and user interaction, and it affects confidentiality, integrity, and availability with a scope change. Although no known exploits are reported in the wild, the potential for session hijacking, credential theft, defacement, or pivoting to further attacks exists. The vulnerability is categorized under CWE-79, which is a common and impactful web security weakness. The plugin is used within WordPress environments, which are widely deployed for websites globally, including Europe. The absence of a patch link suggests that a fix may not yet be publicly available, emphasizing the need for proactive mitigation.

For European organizations, the impact of this vulnerability can be significant, especially for those relying on WordPress websites that utilize the Soli WP Post Signature plugin. Successful exploitation could lead to unauthorized access to user sessions, theft of sensitive information, website defacement, or distribution of malware to site visitors. This can damage organizational reputation, lead to regulatory non-compliance (e.g., GDPR breaches due to data exposure), and cause operational disruptions. Given the medium CVSS score and the requirement for high privileges, the threat is more pronounced in environments where multiple users have elevated access to WordPress administrative functions. The scope change in the CVSS vector indicates that the vulnerability could affect components beyond the initially vulnerable plugin, potentially impacting the entire website or connected systems. European sectors with high web presence such as e-commerce, media, and public services may face increased risks. Additionally, the persistent nature of stored XSS means that malicious scripts remain active until removed, increasing exposure time.

1. Monitor the Soli WP Post Signature plugin repository and vendor communications closely for official patches and apply them immediately upon release. 2. Until a patch is available, restrict plugin usage to trusted administrators only and limit the number of users with high privileges to reduce exploitation risk. 3. Implement strict input validation and output encoding at the application level where possible, especially for user-generated content handled by the plugin. 4. Deploy a Web Application Firewall (WAF) with robust XSS detection and prevention rules to block malicious payloads targeting this vulnerability. 5. Conduct regular security audits and penetration testing focused on WordPress plugins and custom code to identify and remediate similar issues proactively. 6. Educate administrators and users about the risks of stored XSS and the importance of cautious interaction with content generated by privileged users. 7. Consider disabling or replacing the plugin with alternatives that have a stronger security track record if immediate patching is not feasible. 8. Maintain up-to-date backups of affected websites to enable rapid recovery in case of compromise.