CVE-2025-64858 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 certain form fields, allowing a low-privileged attacker to inject malicious JavaScript code that is stored persistently on the server. When other users browse pages containing the injected content, the malicious script executes in their browsers within the security context of the affected site. This can lead to unauthorized actions such as session hijacking, cookie theft, or redirection to malicious sites. The vulnerability requires the attacker to have at least low-level privileges to submit data to the vulnerable forms and requires user interaction (visiting the affected page) for exploitation. The CVSS 3.1 score of 5.4 reflects a medium severity, with network attack vector, low attack complexity, low privileges required, and user interaction needed. The scope is changed (S:C), indicating the vulnerability affects components beyond the vulnerable module, impacting confidentiality and integrity but not availability. No public exploits are known at this time, but the presence of stored XSS in a widely used enterprise content management system poses a significant risk if weaponized. Adobe has not yet released patches, so organizations must rely on interim mitigations.

For European organizations, the impact of CVE-2025-64858 can be significant, especially for those relying on Adobe Experience Manager for public-facing websites, intranets, or customer portals. Exploitation could lead to theft of user credentials, session tokens, or sensitive information, enabling further compromise or unauthorized access. It can also facilitate phishing attacks by injecting deceptive content or redirecting users to malicious sites. The integrity of web content can be undermined, damaging organizational reputation and trust. Although availability is not affected, the confidentiality and integrity breaches can disrupt business operations and compliance with data protection regulations such as GDPR. Organizations in sectors like government, finance, healthcare, and media, which often use AEM for content delivery, are particularly at risk. The medium severity score suggests that while the vulnerability is not trivial, it requires some user interaction and privileges, somewhat limiting the attack surface but still warranting prompt attention.

1. Monitor Adobe’s official channels for patches addressing CVE-2025-64858 and apply them immediately upon release. 2. Implement strict input validation and output encoding on all user-supplied data in AEM forms to prevent malicious script injection. 3. Restrict content submission privileges to trusted users only, minimizing the risk of low-privileged attackers injecting scripts. 4. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in browsers. 5. Conduct regular security audits and penetration testing focused on web application vulnerabilities, including XSS. 6. Educate users and administrators about the risks of XSS and encourage cautious behavior when interacting with web content. 7. Use web application firewalls (WAFs) with rules designed to detect and block XSS payloads targeting AEM. 8. Review and harden AEM configurations to disable or restrict potentially vulnerable components or features. 9. Implement logging and monitoring to detect suspicious activities related to form submissions and script execution. 10. Consider isolating critical AEM instances behind additional authentication layers or network segmentation to reduce exposure.