CVE-2025-64590 is a stored Cross-Site Scripting (XSS) vulnerability identified in Adobe Experience Manager (AEM) versions 6.5.23 and earlier. Stored XSS occurs when malicious scripts are permanently stored on a target server, such as within form fields, and later executed in the browsers of users who access the affected content. In this case, a low-privileged attacker can inject arbitrary JavaScript code into vulnerable input fields that are not properly sanitized or encoded. When other users visit the compromised page, the injected script executes in their browsers, potentially allowing the attacker to steal session cookies, perform actions on behalf of the user, or redirect users to malicious sites. The vulnerability requires user interaction (browsing to the infected page) and privileges to submit data to the vulnerable form, but no elevated privileges are needed. The CVSS 3.1 base score of 5.4 reflects a medium severity, with network attack vector, low attack complexity, low privileges required, and user interaction necessary. The scope is changed, indicating that the vulnerability affects resources beyond the initially vulnerable component. No known exploits have been reported in the wild as of the publication date. The vulnerability is categorized under CWE-79 (Improper Neutralization of Input During Web Page Generation). Adobe has not yet published patches, but organizations are advised to monitor for updates. This vulnerability is significant for organizations relying on AEM for web content management, as it can undermine user trust and lead to data leakage or session compromise.

For European organizations, the impact of CVE-2025-64590 can be substantial, particularly for those using Adobe Experience Manager to manage public-facing websites or intranet portals. Exploitation could lead to theft of user credentials, session hijacking, or unauthorized actions performed in the context of authenticated users, potentially exposing sensitive corporate or customer data. This could result in reputational damage, regulatory penalties under GDPR for data breaches, and operational disruptions if users lose trust in the integrity of web services. Since AEM is widely used by enterprises, government agencies, and media companies across Europe, the threat surface is considerable. The vulnerability does not directly compromise server availability or integrity but can be a stepping stone for further attacks such as phishing or malware distribution. The requirement for user interaction and low privileges means that attackers can exploit this vulnerability with relative ease, increasing the likelihood of targeted or opportunistic attacks. Organizations in sectors with high regulatory scrutiny, such as finance, healthcare, and public administration, face heightened risks from data confidentiality breaches stemming from this XSS flaw.

To mitigate CVE-2025-64590, European organizations should implement a multi-layered approach: 1) Apply official Adobe patches immediately once released to address the vulnerability at the source. 2) Until patches are available, enforce strict input validation and sanitization on all user-submitted data fields within AEM, ensuring that scripts and HTML tags are properly neutralized. 3) Implement robust output encoding to prevent injected scripts from executing in browsers. 4) Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS payloads. 5) Conduct regular security assessments and penetration testing focused on web application inputs and outputs. 6) Educate web developers and administrators on secure coding practices related to XSS prevention. 7) Monitor web traffic and logs for suspicious activity indicative of attempted XSS exploitation. 8) Consider using Web Application Firewalls (WAFs) with rules tuned to detect and block XSS attack patterns targeting AEM. 9) Limit privileges for users who can submit data to vulnerable forms to reduce the attack surface. 10) Maintain an incident response plan to quickly address any detected exploitation attempts.