CVE-2025-64799 is a stored Cross-Site Scripting (XSS) vulnerability identified in Adobe Experience Manager (AEM), a widely used enterprise content management system. The vulnerability exists in versions 6.5.23 and earlier, where certain form fields do not properly sanitize or encode user-supplied input before storing and rendering it. This flaw allows a low-privileged attacker to inject malicious JavaScript code into these fields. When a victim subsequently accesses a page containing the injected script, the malicious code executes within their browser context. This can lead to unauthorized actions such as session hijacking, credential theft, or unauthorized modification of displayed content. The vulnerability requires the attacker to have some level of access to submit data (low privilege) and requires user interaction (the victim must visit the affected page). The CVSS v3.1 base score is 5.4, indicating medium severity, with the vector AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N, meaning the attack is network exploitable with low complexity, requires privileges and user interaction, and impacts confidentiality and integrity with a scope change. No public exploits have been reported yet, but the vulnerability is published and should be addressed promptly. The lack of available patches at the time of reporting means organizations must rely on interim mitigations such as input validation and CSP enforcement.

For European organizations, the impact of this vulnerability can be significant, especially for those relying on Adobe Experience Manager to deliver web content and digital services. Successful exploitation could allow attackers to execute arbitrary scripts in the browsers of employees, customers, or partners, potentially leading to theft of sensitive information such as authentication tokens, personal data, or intellectual property. It could also enable attackers to perform actions on behalf of users, undermining trust and potentially causing reputational damage. Public-facing AEM instances are particularly at risk, as they expose a wider user base to malicious payloads. The medium severity rating reflects that while the vulnerability does not directly impact system availability, it compromises confidentiality and integrity, which are critical for compliance with European data protection regulations such as GDPR. Organizations in sectors like finance, government, healthcare, and e-commerce, which often use AEM for content delivery, may face increased risk and regulatory scrutiny if exploited.

1. Monitor Adobe's official channels for patches addressing CVE-2025-64799 and apply them immediately upon release. 2. Implement strict input validation on all form fields to reject or sanitize potentially malicious input before storage. 3. Apply output encoding on all user-supplied data rendered in web pages 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 XSS. 6. Limit privileges for users who can submit data to the vulnerable forms to reduce the attack surface. 7. Educate users about the risks of interacting with suspicious content and encourage reporting of unusual behavior. 8. Use web application firewalls (WAF) with rules designed to detect and block XSS payloads targeting AEM. 9. Review and harden AEM configurations to minimize exposure of vulnerable components. 10. Implement multi-factor authentication to reduce the impact of stolen credentials resulting from XSS exploitation.