CVE-2025-64563: 
Adobe Experience Manager vulnerability analysis and mitigation

CVE-2025-64563 is a DOM-based Cross-Site Scripting (XSS) vulnerability in Adobe Experience Manager (AEM) that allows a low-privileged attacker to execute malicious scripts in the context of a victim's browser. It affects AEM versions 6.5.23 and earlier (on-premise) and AEM Cloud Service versions prior to 2025.12.0. The vulnerability was published on December 9–10, 2025, with a patch released the same day. It carries a CVSS v3.1 base score of 5.4 (Medium) (Adobe Advisory).

The root cause is improper neutralization of user-supplied input during web page generation (CWE-79), specifically manifesting as a DOM-based XSS flaw. An attacker with low privileges can craft a malicious URL or manipulate a web page such that, when visited by a victim, client-side JavaScript processes attacker-controlled data and injects it into the DOM without proper sanitization. Exploitation requires user interaction — the victim must visit a crafted URL or interact with a manipulated page — and the vulnerability has a changed scope, meaning the injected script executes in the context of the victim's browser session on the AEM application (Adobe Advisory, EUVD).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the victim's browser session within the AEM application context, potentially leading to session token theft, credential harvesting, unauthorized actions performed on behalf of the victim, and limited data exfiltration. The changed scope means the impact extends beyond the attacker's own session, affecting confidentiality and integrity (low impact each) of the victim's interaction with the application. Availability is not directly impacted (Adobe Advisory).

1. Reconnaissance: Identify AEM instances running versions 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 account).
3. Identify vulnerable DOM sink: Locate an AEM page or component that reflects attacker-controlled input into the DOM without sanitization — typical targets include search parameters, URL fragments, or query strings processed by client-side JavaScript.
4. Craft malicious URL: Construct a URL containing a DOM-based XSS payload (e.g., appending #<img src=x onerror=alert(document.cookie)> or a more sophisticated payload to steal session tokens) targeting the vulnerable AEM endpoint.
5. Deliver to victim: Send the crafted URL to a higher-privileged AEM user (e.g., administrator) via phishing email, chat, or embedded link.
6. Harvest results: When the victim visits the URL, the malicious script executes in their browser, potentially exfiltrating session cookies, CSRF tokens, or performing actions on the AEM instance with the victim's privileges (Adobe Advisory).

• Network: Unusual outbound HTTP requests from victim browsers to attacker-controlled domains (e.g., via fetch(), XMLHttpRequest, or <img> tags with external src) originating from AEM page interactions.
• Logs: AEM access logs showing requests to AEM pages with suspicious URL fragments or query parameters containing encoded JavaScript payloads (e.g., %3Cscript%3E, onerror=, javascript:).
• Logs: Browser-side console errors or network requests to unexpected external endpoints logged in web application firewall (WAF) or proxy logs following user interaction with AEM pages.
• File System: No direct file system artifacts expected for DOM-based XSS; however, monitor for unexpected content modifications in AEM if the XSS is chained with CSRF to alter stored content.

Adobe has released patches addressing CVE-2025-64563 as part of security bulletin APSB25-115, published December 9, 2025. AEM on-premise users should upgrade to version 6.5.24.0 or later; AEM Cloud Service customers should ensure their environment is updated to the 2025.12.0 release or later. No specific configuration-based workaround is documented; upgrading to the patched version is the recommended remediation. Organizations should also consider deploying a WAF with XSS filtering rules as a defense-in-depth measure (Adobe Advisory).

The Center for Internet Security (CIS) issued an advisory noting multiple vulnerabilities in Adobe products, including this CVE, could allow for arbitrary code execution, recommending prompt patching (CIS Advisory). Tenable flagged the issue in their vulnerability pipeline shortly after disclosure. Community discussion on platforms such as Bluesky and Mastodon/CIRCL was limited, reflecting the medium severity and lack of active exploitation. No notable independent researcher commentary or detailed technical write-ups have been published beyond the vendor advisory.