CVE-2025-64559 is a stored Cross-Site Scripting (XSS) vulnerability identified in Adobe Experience Manager (AEM) versions 6.5.23 and earlier. This vulnerability allows an attacker with low privileges to inject malicious JavaScript code into vulnerable form fields within the AEM environment. When other users browse pages containing these injected scripts, the malicious code executes in their browsers, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the victim. The vulnerability arises due to insufficient input sanitization and output encoding in form fields, allowing persistent script injection. The CVSS v3.1 score of 5.4 indicates a medium severity, reflecting that the attack vector is network-based, requires low privileges, and user interaction (visiting the malicious page) is necessary. The scope is changed (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component, such as user sessions or data confidentiality. There is no impact on availability, and no known exploits have been reported in the wild as of the publication date. Adobe has not yet released a patch, but organizations are advised to monitor for updates and apply them promptly. The vulnerability is categorized under CWE-79, a common and well-understood web application security issue. Given AEM's widespread use in enterprise digital experience management, this vulnerability poses a significant risk if exploited, especially in environments with many users and sensitive data.

For European organizations, the impact of CVE-2025-64559 can be significant, particularly for those relying on Adobe Experience Manager for content management and digital customer engagement. Exploitation could lead to unauthorized access to user sessions, theft of sensitive information such as authentication tokens or personal data, and potential defacement or manipulation of web content. This can damage organizational reputation, lead to regulatory non-compliance (e.g., GDPR breaches due to data exposure), and disrupt business operations. Since the vulnerability requires user interaction, phishing or social engineering campaigns could be used to lure users to maliciously crafted pages. The medium severity rating suggests the impact is moderate but could escalate if combined with other vulnerabilities or used as a foothold for further attacks. European sectors such as finance, government, healthcare, and e-commerce, which often use AEM for their web presence, are particularly at risk. The persistent nature of stored XSS means that once injected, malicious scripts can affect many users over time until the vulnerability is remediated.

1. Monitor Adobe security advisories closely and apply official patches or updates for Adobe Experience Manager as soon as they are released. 2. Implement strict input validation on all form fields to reject or sanitize potentially malicious input before storage. 3. Apply robust output encoding/escaping techniques 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 assessments and code reviews focusing on input handling and output rendering in AEM customizations. 6. Educate users about the risks of clicking on suspicious links and implement phishing detection mechanisms. 7. Use web application firewalls (WAFs) configured to detect and block common XSS attack patterns targeting AEM. 8. Limit privileges of users who can submit data to vulnerable forms to reduce the attack surface. 9. Consider isolating critical AEM instances or sensitive content behind additional authentication or network segmentation to reduce exposure. 10. Maintain comprehensive logging and monitoring to detect anomalous activities that may indicate exploitation attempts.