CVE-2025-64800 is a stored Cross-Site Scripting (XSS) vulnerability identified in Adobe Experience Manager (AEM), specifically affecting versions 6.5.23 and earlier. The 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 persistently stored on the server. When a victim user accesses the affected page containing the malicious payload, the script executes in their browser context. This can lead to theft of session cookies, user impersonation, unauthorized actions, or manipulation of displayed content. The vulnerability is classified under CWE-79 and has a CVSS 3.1 base score of 5.4, indicating medium severity. The attack vector is network-based with low attack complexity, requiring low privileges and user interaction, and it affects confidentiality and integrity but not availability. No patches or exploit code are currently publicly available, and no known exploits in the wild have been reported. The vulnerability's scope is limited to web clients interacting with vulnerable AEM instances, typically used for enterprise content management and digital experience delivery. Adobe Experience Manager is widely used by organizations for managing web content, making this vulnerability relevant for enterprises with public-facing or internal portals. The stored nature of the XSS increases the risk compared to reflected XSS, as malicious scripts persist and affect multiple users. The vulnerability's exploitation could facilitate further attacks such as session hijacking, phishing, or privilege escalation within the affected web application environment.

For European organizations, the impact of CVE-2025-64800 can be significant, especially for those relying on Adobe Experience Manager for their web content management and digital experience platforms. Exploitation could lead to unauthorized disclosure of sensitive information, including session tokens and user credentials, compromising user accounts and internal systems. The integrity of web content could be undermined, damaging organizational reputation and trust. Public-facing portals could be used as vectors for broader phishing or malware distribution campaigns. Although availability is not directly impacted, the indirect effects of compromised user sessions and manipulated content could disrupt business operations and customer interactions. Given the medium CVSS score, the threat is moderate but should not be underestimated, particularly in sectors handling sensitive data such as finance, healthcare, and government services. The lack of known exploits currently provides a window for proactive mitigation, but the stored XSS nature means that once exploited, multiple users could be affected over time.

To mitigate CVE-2025-64800, organizations should prioritize the following actions: 1) Monitor Adobe's security advisories closely and apply patches or updates as soon as they become available for affected AEM versions. 2) Implement strict input validation and output encoding on all user-supplied data in form fields to prevent injection of malicious scripts. 3) Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 4) Conduct regular security assessments and penetration testing focused on web application vulnerabilities, including XSS. 5) Educate developers and administrators on secure coding practices specific to AEM and web applications. 6) Use web application firewalls (WAFs) with rules designed to detect and block XSS payloads targeting AEM. 7) Limit user privileges to the minimum necessary to reduce the attack surface. 8) Monitor logs and user activity for signs of suspicious behavior indicative of exploitation attempts. These measures combined will reduce the risk of exploitation and limit potential damage.