CVE-2025-64555 is a stored Cross-Site Scripting (XSS) vulnerability identified in Adobe Experience Manager (AEM) versions 6.5.23 and earlier. Stored XSS vulnerabilities occur when an attacker is able to inject malicious scripts into persistent data stores, such as form fields, which are then served to other users. In this case, a low-privileged attacker can submit malicious JavaScript code into vulnerable form fields within AEM. When other users access pages containing these fields, the injected scripts execute in their browsers, potentially allowing the attacker to steal session cookies, perform actions on behalf of the user, or manipulate displayed content. The vulnerability requires the attacker to have some level of access to submit data (low privilege) and requires user interaction (visiting the affected page) for exploitation. The CVSS 3.1 base score is 5.4, indicating medium severity, with attack vector network, low attack complexity, low privileges required, and user interaction necessary. The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. The impact on confidentiality and integrity is low, with no impact on availability. No patches are currently linked, and no known exploits have been reported in the wild. Given AEM's widespread use in enterprise content management, this vulnerability poses a risk to organizations relying on it for web content delivery.

For European organizations, the impact of CVE-2025-64555 can be significant, especially for those using Adobe Experience Manager to manage public-facing websites or intranet portals. Exploitation could lead to theft of user credentials or session tokens, enabling attackers to impersonate users or escalate privileges. This can result in unauthorized access to sensitive information, manipulation of website content, or distribution of malware through compromised pages. While the vulnerability does not affect system availability, the breach of confidentiality and integrity can damage organizational reputation, lead to regulatory non-compliance (e.g., GDPR), and cause financial losses. Organizations with high volumes of web traffic or handling sensitive user data are particularly at risk. The requirement for user interaction and low privileges reduces the likelihood of widespread automated exploitation but does not eliminate targeted attacks.

To mitigate CVE-2025-64555, European organizations should: 1) Monitor Adobe's official channels for patches and apply them promptly once available. 2) Implement strict input validation on all form fields to reject or sanitize potentially malicious scripts before storage. 3) Employ robust output encoding to ensure that any user-supplied data rendered on web pages does not execute as code. 4) Configure 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) 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) Limit privileges for users who can submit content to reduce the attack surface. These measures, combined, will reduce the risk and potential impact of exploitation.