CVE-2025-64793 is a stored Cross-Site Scripting (XSS) vulnerability identified in Adobe Experience Manager (AEM) versions 6.5.23 and earlier. The vulnerability arises from insufficient sanitization of user input in form fields, allowing an attacker with low privileges to inject malicious JavaScript code that is stored persistently on the server. When legitimate users access the affected pages, the malicious script executes in their browsers, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the user. The vulnerability requires user interaction, as victims must visit the compromised page for the script to execute. The CVSS 3.1 base score of 5.4 reflects a medium severity, considering the attack vector is network-based, the attack complexity is low, privileges required are low, but user interaction is necessary. The scope is changed (S:C), indicating the vulnerability can affect components beyond the initially vulnerable module. Confidentiality and integrity impacts are rated low, with no impact on availability. No patches are currently linked, and no known exploits have been reported in the wild. Adobe Experience Manager is widely used in enterprise content management, making this vulnerability significant for organizations relying on AEM for their digital presence. The vulnerability underscores the importance of secure coding practices, particularly input validation and output encoding, to prevent injection attacks. Additionally, defense-in-depth measures such as Content Security Policy (CSP) can mitigate the risk of script execution even if injection occurs.

For European organizations, this vulnerability poses a risk primarily to confidentiality and integrity of user sessions and data. Attackers could exploit the stored XSS to steal session cookies, perform unauthorized actions, or deliver further malware payloads via the victim's browser. Organizations using Adobe Experience Manager for public-facing websites or intranet portals may face reputational damage, data breaches, or compliance issues under GDPR if user data is compromised. The impact is heightened in sectors such as government, finance, healthcare, and media, where AEM is commonly deployed and where data sensitivity and regulatory requirements are stringent. Although no availability impact is expected, the potential for lateral attacks or privilege escalation through session hijacking could lead to broader compromise. The requirement for user interaction limits the attack's reach but does not eliminate risk, especially if phishing or social engineering is used to lure victims to vulnerable pages. The absence of known exploits in the wild provides a window for mitigation before active exploitation occurs.

1. Monitor Adobe's official channels for patches addressing CVE-2025-64793 and apply them promptly once released. 2. Implement strict input validation on all form fields to sanitize and reject malicious scripts before storage. 3. Employ robust output encoding techniques to ensure that any user-generated content rendered on web pages does not execute as code. 4. Configure Content Security Policy (CSP) headers to restrict the execution of inline scripts and limit sources of executable scripts, reducing the impact of injected code. 5. Conduct regular security audits and penetration testing focused on injection vulnerabilities within AEM deployments. 6. Educate content authors and administrators on safe content practices to avoid inadvertent introduction of malicious scripts. 7. Use web application firewalls (WAFs) with rules tuned to detect and block XSS payloads targeting AEM. 8. Limit privileges of users who can submit content to reduce the attack surface. 9. Monitor logs and user activity for unusual behavior indicative of exploitation attempts. 10. Consider implementing multi-factor authentication (MFA) to reduce the impact of session hijacking.