CVE-2025-64827 is a stored Cross-Site Scripting (XSS) vulnerability identified in Adobe Experience Manager (AEM) versions 6.5.23 and earlier. Stored XSS occurs when malicious scripts are permanently stored on a target server, such as within form fields, and later executed in the browsers of users who access the affected content. In this case, a low-privileged attacker can inject JavaScript code into vulnerable form fields within AEM, which is then stored and executed when other users browse the compromised pages. The vulnerability leverages improper input sanitization and output encoding, allowing script injection. The CVSS 3.1 base score is 5.4, indicating medium severity. The vector indicates network attack vector (AV:N), low attack complexity (AC:L), requiring low privileges (PR:L), user interaction (UI:R), scope changed (S:C), and impacts on confidentiality and integrity (C:L/I:L) but no availability impact (A:N). This means an attacker must have some access to the system and rely on a user visiting the malicious content to execute the attack. The scope change indicates that the vulnerability affects components beyond the initially vulnerable component, potentially impacting other parts of the system or user sessions. Although no public exploits are known, the vulnerability could enable attackers to steal sensitive information such as session cookies, perform actions on behalf of users, or deliver further malware payloads. Adobe has not yet released patches, so organizations must rely on interim mitigations. Given AEM's widespread use in enterprise content management and digital experience platforms, this vulnerability poses a risk to organizations that rely on it for web content delivery and customer engagement.

For European organizations, the impact of CVE-2025-64827 can be significant in terms of confidentiality and integrity of user data and sessions. Attackers exploiting this vulnerability could hijack user sessions, steal credentials, or manipulate displayed content, potentially leading to unauthorized access or reputational damage. Organizations in sectors such as finance, government, healthcare, and e-commerce that use Adobe Experience Manager to manage customer-facing websites or intranet portals are particularly at risk. The vulnerability could be leveraged in targeted phishing or social engineering campaigns to compromise privileged users or customers. While availability is not directly affected, the indirect consequences of data breaches or trust erosion could be severe. The requirement for low privileges and user interaction lowers the barrier for exploitation, increasing the likelihood of successful attacks if mitigations are not applied promptly.

1. Apply official Adobe patches immediately upon release to remediate the vulnerability. 2. Until patches are available, implement strict input validation and output encoding on all form fields and user-generated content within AEM to prevent script injection. 3. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 4. Conduct regular security audits and code reviews focusing on user input handling in AEM components. 5. Monitor web server and application logs for unusual activities or repeated attempts to inject scripts. 6. Educate users and administrators about the risks of XSS and encourage cautious behavior when interacting with web content. 7. Consider deploying Web Application Firewalls (WAFs) with rules tailored to detect and block XSS payloads targeting AEM. 8. Limit privileges of users who can submit content to reduce the attack surface. 9. Isolate critical AEM instances and restrict access to trusted networks where possible. 10. Maintain up-to-date backups and incident response plans to quickly recover from potential compromises.