CVE-2025-64839 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 persistently stored on the server. When other users access the affected pages containing these injected scripts, the malicious code executes within their browsers under the context of the vulnerable application. This can lead to theft of session cookies, user impersonation, unauthorized actions, and potential data leakage. The vulnerability has a CVSS v3.1 base score of 5.4, indicating medium severity. The attack vector is network-based (AV:N), requires low privileges (PR:L), and user interaction (UI:R) to trigger, with a scope change (S:C) meaning the vulnerability can affect resources beyond the initially compromised component. The impact primarily affects confidentiality and integrity, with no direct impact on availability. No patches were linked at the time of publication, and no known exploits are reported in the wild. Given Adobe Experience Manager's widespread use in enterprise content management, especially in Europe, this vulnerability poses a moderate risk to organizations relying on this platform for web content delivery and digital asset management.

For European organizations, this vulnerability could lead to unauthorized access to sensitive information, session hijacking, and potential manipulation of web content or user actions within Adobe Experience Manager-powered sites. This is particularly concerning for sectors such as government, finance, healthcare, and media, where AEM is commonly used to manage public-facing websites and internal portals. Exploitation could result in reputational damage, regulatory non-compliance (e.g., GDPR violations due to data leakage), and financial losses. Since the vulnerability requires user interaction, phishing or social engineering campaigns could be used to lure users to maliciously crafted pages. The medium severity score reflects that while the vulnerability is not critical, it can be leveraged as a stepping stone for more advanced attacks or lateral movement within an organization’s digital infrastructure. The lack of known exploits in the wild currently reduces immediate risk but does not eliminate the need for prompt mitigation.

1. Monitor Adobe’s official channels for patches or updates addressing CVE-2025-64839 and apply them promptly once available. 2. Implement strict input validation and output encoding on all user-supplied data in AEM forms to prevent injection of malicious scripts. 3. Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS payloads. 4. Conduct regular security audits and penetration testing focused on web application vulnerabilities within AEM environments. 5. Educate users and administrators about the risks of XSS and the importance of cautious interaction with suspicious links or content. 6. Utilize web application firewalls (WAFs) with updated signatures to detect and block common XSS attack patterns targeting AEM. 7. Limit privileges of users who can submit data to vulnerable forms to reduce the likelihood of malicious input. 8. Review and harden AEM configurations to minimize exposure of vulnerable components and unnecessary services.