CVE-2025-64875 is a stored Cross-Site Scripting (XSS) vulnerability identified in Adobe Experience Manager (AEM) versions 6.5.23 and earlier. This vulnerability arises from insufficient sanitization of user input in certain form fields, allowing an attacker with low privileges to inject malicious JavaScript code that is stored persistently on the server. When legitimate users access pages containing the injected payload, the malicious script executes in their browsers within the security context of the affected site. This can lead to theft of sensitive information such as session cookies, user credentials, or manipulation of displayed content, thereby compromising confidentiality and integrity. The vulnerability has a CVSS 3.1 base score of 5.4, indicating medium severity, with an attack vector over the network, low attack complexity, requiring privileges and user interaction, and impacting confidentiality and integrity but not availability. No public exploits have been reported yet, but the vulnerability is significant given AEM's widespread use in enterprise content management. The vulnerability is categorized under CWE-79, a common and well-understood class of web application security flaws. Adobe has not yet published patches but organizations should monitor for updates and apply them promptly once available.

For European organizations, the impact of this vulnerability can be significant, especially for those relying on Adobe Experience Manager for managing public-facing websites or internal portals. Exploitation could lead to unauthorized disclosure of sensitive user data, session hijacking, and potential defacement or manipulation of web content, undermining user trust and compliance with data protection regulations such as GDPR. The stored nature of the XSS means that multiple users can be affected once the malicious script is injected. This can result in reputational damage, legal liabilities, and operational disruptions. Given the medium severity, the risk is moderate but non-negligible, particularly for sectors like finance, government, and healthcare where AEM is often deployed. The requirement for low privileges and user interaction lowers the barrier for exploitation compared to more complex attacks, increasing the likelihood of successful attacks if unmitigated.

1. Monitor Adobe's official channels for patches addressing CVE-2025-64875 and apply them immediately upon release. 2. Implement strict input validation on all form fields to reject or sanitize potentially malicious input before storage. 3. Employ robust output encoding techniques to ensure that any user-supplied data rendered on web pages cannot be interpreted as executable code. 4. Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of any injected code. 5. Conduct regular security audits and penetration testing focused on XSS vulnerabilities within AEM deployments. 6. Educate developers and administrators on secure coding practices and the risks associated with stored XSS. 7. Where possible, restrict privileges for users who can submit data to vulnerable forms to minimize attack surface. 8. Use web application firewalls (WAFs) with rules designed to detect and block XSS payloads targeting AEM. 9. Monitor web logs and user reports for suspicious activity indicative of exploitation attempts.