CVE-2025-64887: 
Adobe Experience Manager vulnerability analysis and mitigation

CVE-2025-64887 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-premises) and AEM Cloud Service versions prior to 2025.12.0. The vulnerability was published on December 9, 2025, with a patch released 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), specifically of the DOM-based variant. An attacker with low privileges can craft a malicious URL or manipulate a web page such that unsanitized input is processed by the victim's browser DOM, causing script execution without server-side reflection. Exploitation requires user interaction — the victim must visit a crafted URL or interact with a manipulated page. No public proof-of-concept code has been identified at this time (Adobe Advisory).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of the victim's browser session within AEM, potentially leading to session token theft, credential harvesting, unauthorized actions on behalf of the victim, or redirection to malicious sites. The scope is marked as "Changed," meaning the impact can extend beyond the vulnerable component to affect other browser-accessible resources. Confidentiality and integrity are both partially impacted, while availability is not affected (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. Identify vulnerable DOM sink: Locate AEM pages or components that reflect attacker-controlled input into the DOM without proper sanitization — typical targets include URL parameters processed by client-side JavaScript.
3. Craft malicious URL: Construct a URL containing a DOM-based XSS payload (e.g., #<img src=x onerror=alert(document.cookie)> or similar) targeting the vulnerable parameter or fragment identifier.
4. Deliver to victim: Send the crafted URL to a low-privileged or higher-privileged AEM user via phishing email, social engineering, or embedding in a shared document.
5. Achieve script execution: When the victim visits the URL and the browser processes the malicious DOM input, the injected script executes in the victim's browser session, enabling session hijacking, credential theft, or further attacks (Adobe Advisory).

• Network: Unusual outbound requests from victim browsers to attacker-controlled domains following AEM page visits; unexpected cross-origin requests originating from AEM pages.
• Logs: AEM access logs showing requests to AEM pages with suspicious URL fragments or parameters containing encoded script tags (e.g., %3Cscript%3E, onerror=, javascript:).
• Browser/Client: Unexpected JavaScript execution or pop-ups when accessing AEM pages; browser developer console errors related to DOM manipulation on AEM pages.
• Application: Reports from users of unexpected redirects or session anomalies after visiting specific AEM URLs.

Adobe has released patches addressing CVE-2025-64887: AEM on-premises users should upgrade to version 6.5.24.0 or later, and AEM Cloud Service users should ensure they are on release 2025.12.0 or later. No specific configuration-based workaround has been published; upgrading to the patched version is the recommended remediation. Organizations should also enforce Content Security Policy (CSP) headers on AEM instances as a defense-in-depth measure to limit the impact of any XSS vulnerabilities (Adobe Advisory).

The CIS (Center for Internet Security) issued an advisory noting multiple vulnerabilities in Adobe products that could allow for arbitrary code execution, grouping CVE-2025-64887 among the December 2025 Adobe patch batch (CIS Advisory). No significant independent researcher commentary or notable social media discussion specific to this CVE has been identified beyond routine vulnerability tracking posts.