CVE-2025-64863 is a stored Cross-Site Scripting (XSS) vulnerability identified in Adobe Experience Manager (AEM) versions 6.5.23 and earlier. This vulnerability arises due to insufficient sanitization of user-supplied input in certain form fields, allowing an attacker with low privileges to inject malicious JavaScript code that is stored persistently on the server. When other users access the affected pages containing the injected scripts, their browsers execute the malicious code, potentially leading to session hijacking, credential theft, or unauthorized actions performed in the context of the victim's session. The vulnerability requires the attacker to have the ability to submit data to the vulnerable form fields, implying some level of interaction and privileges, but not administrative rights. The CVSS 3.1 base score of 5.4 reflects a medium severity, with the vector indicating network attack vector (AV:N), low attack complexity (AC:L), low privileges required (PR:L), user interaction required (UI:R), scope changed (S:C), and impacts on confidentiality and integrity (C:L/I:L) but no impact on availability (A:N). No patches are currently linked, and no known exploits have been reported in the wild, suggesting the vulnerability is newly disclosed. The vulnerability falls under CWE-79, a common and well-understood class of web application security issues. Given AEM's role as a widely used enterprise content management system, exploitation could affect a broad range of organizations that rely on it for digital content delivery and customer engagement.

For European organizations, the impact of CVE-2025-64863 can be significant, especially for those using Adobe Experience Manager to manage public-facing websites or intranet portals. Successful exploitation could lead to the execution of arbitrary JavaScript in users' browsers, enabling attackers to steal session cookies, perform actions on behalf of users, or redirect users to malicious sites. This compromises the confidentiality and integrity of user data and organizational information. While availability is not directly impacted, the reputational damage and potential regulatory consequences under GDPR for data breaches involving personal information could be substantial. Organizations in sectors such as finance, government, healthcare, and e-commerce, which often use AEM for digital experiences, may face increased risks. The requirement for user interaction and low privileges reduces the ease of exploitation but does not eliminate the threat, particularly in environments with many users or public access. The absence of known exploits currently provides a window for proactive mitigation before widespread attacks occur.

1. Monitor Adobe's official channels for patches addressing CVE-2025-64863 and apply them promptly once released. 2. Implement strict input validation on all form fields to reject or sanitize potentially malicious input before storage. 3. Employ comprehensive output encoding (e.g., HTML entity encoding) when rendering user-supplied data to prevent script execution. 4. Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of XSS attacks. 5. Conduct regular security audits and penetration testing focused on web application vulnerabilities, including stored XSS. 6. Educate developers and administrators on secure coding practices specific to AEM and web applications. 7. Limit user privileges to the minimum necessary to reduce the risk of malicious input submission. 8. Monitor web server and application logs for unusual activity indicative of attempted exploitation. 9. Consider implementing Web Application Firewalls (WAF) with rules tailored to detect and block XSS payloads targeting AEM. 10. Review and harden session management to mitigate session hijacking risks if exploitation occurs.