CVE-2025-64542: Adobe Experience Manager DOM XSS Vulnerability

CVE-2025-64542 Overview

Adobe Experience Manager (AEM) contains a DOM-based Cross-Site Scripting (XSS) vulnerability tracked as CVE-2025-64542. An attacker can manipulate the Document Object Model (DOM) environment to execute malicious JavaScript within the victim's browser context. Successful exploitation requires user interaction: the victim must visit a crafted webpage. The vulnerability has a changed scope, meaning impact extends beyond the vulnerable component. Adobe published this issue under advisory APSB26-98. The weakness maps to [CWE-79], Improper Neutralization of Input During Web Page Generation.

Critical Impact

Attackers can execute arbitrary JavaScript in an authenticated user's browser session, enabling session token theft, defacement, and cross-origin actions under the user's identity.

Affected Products

• Adobe Experience Manager (AEM) — refer to Adobe advisory APSB26-98 for exact affected versions
• Adobe Experience Manager Cloud Service deployments
• Adobe Experience Manager on-premises installations

Discovery Timeline

• 2026-09-08 - CVE-2025-64542 published to the National Vulnerability Database (NVD)
• 2026-09-08 - Last updated in NVD database

Technical Details for CVE-2025-64542

Vulnerability Analysis

CVE-2025-64542 is a DOM-based XSS flaw in Adobe Experience Manager. Unlike reflected or stored XSS, DOM-based XSS occurs entirely in the browser. Client-side JavaScript reads attacker-controlled data from a source such as document.location, document.URL, or window.name and writes it into a dangerous sink like innerHTML, document.write, or eval without proper sanitization.

Exploitation requires a low-privileged authenticated user to visit a crafted webpage. The attack succeeds when AEM client-side code processes hostile input and injects it into the DOM as executable script. The changed scope indicates the injected script can affect resources beyond the vulnerable component, such as parent frames, adjacent origins, or authenticated administrative contexts sharing the browser session.

Root Cause

The root cause is improper neutralization of user-controlled input in client-side JavaScript rendering paths within AEM. The application trusts input read from the DOM and passes it to a sink that interprets HTML or JavaScript. Adobe has not disclosed the specific vulnerable component or parameter in the public advisory.

Attack Vector

The attack requires network access, low privileges, and user interaction. An attacker crafts a malicious URL or webpage containing a payload targeting the vulnerable AEM DOM sink. The victim, typically an authenticated AEM author or content editor, visits the crafted page. The browser processes the payload and executes attacker JavaScript within the AEM origin. See the Adobe Security Advisory APSB26-98 for vendor-supplied technical details.

Detection Methods for CVE-2025-64542

Indicators of Compromise

• Web server access logs showing unusual URL fragments, hash parameters, or query strings containing JavaScript keywords such as javascript:, onerror=, onload=, or encoded <script> tags targeting AEM endpoints
• Outbound browser requests from AEM author sessions to unfamiliar external domains, suggesting credential or token exfiltration
• Unexpected AEM administrative changes, such as new users, altered content, or modified permissions performed by legitimate accounts

Detection Strategies

• Deploy Content Security Policy (CSP) reporting to capture inline script violations and unauthorized script sources on AEM origins
• Monitor browser telemetry and Endpoint Detection and Response (EDR) alerts for suspicious child processes or network connections spawned during AEM author sessions
• Inspect proxy and WAF logs for URI patterns containing DOM-XSS signatures targeting AEM paths such as /content/, /etc/, /libs/, and /apps/

Monitoring Recommendations

• Correlate AEM audit logs with authentication events to identify actions performed shortly after a user visited an external link
• Alert on anomalous session cookie usage, such as concurrent sessions from geographically distinct sources for the same AEM account
• Track outbound HTTP requests from author workstations to newly registered or low-reputation domains

How to Mitigate CVE-2025-64542

Immediate Actions Required

• Apply the Adobe security updates referenced in Adobe Security Advisory APSB26-98 as soon as vendor guidance permits
• Restrict AEM author instance access to trusted internal networks and VPN-connected users only
• Instruct AEM authors and administrators to avoid clicking untrusted links while authenticated to AEM environments

Patch Information

Adobe released fixed versions of Adobe Experience Manager alongside advisory APSB26-98. Administrators should consult the advisory for exact patched build numbers matching their deployment type (Cloud Service, AMS, or on-premises) and apply the corresponding update package.

Workarounds

• Enforce a strict Content Security Policy on AEM author and publish origins to prohibit inline scripts and restrict script sources
• Deploy a Web Application Firewall (WAF) rule set that blocks common DOM-XSS payload patterns targeting AEM URIs
• Enable browser isolation or dedicated administrative browsers for AEM author accounts to contain script execution

# Example CSP response header for AEM author dispatcher
# Adjust script-src to match your deployment before enforcing
Header always set Content-Security-Policy "default-src 'self'; script-src 'self' 'nonce-{RANDOM}'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'; report-uri /csp-report"