CVE-2025-64197 is a stored Cross-site Scripting (XSS) vulnerability identified in the sizam Rehub WordPress theme, affecting versions prior to 19.9.9.1. The vulnerability stems from improper neutralization of input during the generation of web pages, which allows attackers to inject malicious scripts that are stored and later executed in the context of users visiting the affected site. This type of vulnerability can lead to a range of attacks including session hijacking, credential theft, defacement, and distribution of malware. The CVSS 3.1 base score is 6.5, indicating a medium severity level, with the vector AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L. This means the attack can be launched remotely over the network with low attack complexity, requires low privileges (authenticated user), and user interaction (such as clicking a link) is necessary. The scope is changed (S:C), indicating that the vulnerability affects resources beyond the vulnerable component, potentially impacting other parts of the system. Confidentiality, integrity, and availability impacts are all rated low but present. No known exploits have been reported in the wild as of the publication date. The vulnerability affects the Rehub theme, which is widely used for affiliate marketing, price comparison, and e-commerce websites built on WordPress. Since the theme is popular in various markets, including Europe, the risk is relevant for organizations using this theme without applying patches or mitigations. The vulnerability was published on October 29, 2025, and no official patch links were provided at the time of reporting, suggesting that users should monitor vendor announcements closely. The improper input neutralization likely involves insufficient sanitization or encoding of user-supplied data before rendering it on web pages, a common cause of stored XSS. Attackers with low privileges can exploit this by injecting malicious payloads that execute in the browsers of other users, potentially leading to session hijacking or unauthorized actions performed on behalf of victims.

For European organizations, the impact of CVE-2025-64197 can be significant, particularly for those operating e-commerce, affiliate marketing, or content-heavy websites using the sizam Rehub theme. Successful exploitation can lead to theft of user credentials, session tokens, and sensitive data, undermining user trust and potentially causing regulatory compliance issues under GDPR due to data breaches. The integrity of website content can be compromised, leading to defacement or distribution of malicious content, which can damage brand reputation. Availability impacts, while rated low, may occur if attackers use the vulnerability to inject scripts that disrupt normal website operations or redirect users to malicious sites. Since the vulnerability requires low privileges but does require user interaction, the attack vector often involves social engineering or phishing to trick users into triggering the malicious payload. The medium severity score reflects a balanced risk that should not be ignored, especially for high-traffic websites. European organizations may also face legal and financial consequences if customer data is compromised. The lack of known exploits in the wild currently reduces immediate risk but does not eliminate it, as attackers may develop exploits once patches are released. Organizations relying on Rehub theme should assess their exposure and prioritize remediation to prevent exploitation.

1. Update the sizam Rehub theme to version 19.9.9.1 or later as soon as the patch becomes available from the vendor. 2. Until patches are applied, implement strict input validation and output encoding on all user-supplied data to prevent malicious script injection. 3. Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. 4. Conduct regular security audits and code reviews focusing on input handling and output encoding in the theme and any customizations. 5. Educate users and administrators about the risks of phishing and social engineering that could trigger stored XSS payloads. 6. Monitor web server and application logs for unusual activities or repeated attempts to inject scripts. 7. Use Web Application Firewalls (WAF) with updated rules to detect and block XSS payloads targeting the Rehub theme. 8. Limit user privileges to the minimum necessary to reduce the risk posed by low-privilege attackers. 9. Backup website data regularly to enable quick recovery in case of defacement or data corruption. 10. Coordinate with the vendor and security communities to stay informed about updates and emerging exploit techniques related to this vulnerability.