CVE-2026-75629: Adobe Experience Manager XSS Vulnerability

CVE-2026-75629 Overview

Adobe Experience Manager (AEM) contains a DOM-based Cross-Site Scripting (XSS) vulnerability tracked as CVE-2026-75629. An attacker can manipulate the Document Object Model (DOM) environment to execute arbitrary JavaScript in the context of a victim's browser session. Exploitation requires user interaction: the victim must visit a crafted webpage under attacker control or influence. The vulnerability carries a changed scope, meaning execution impacts resources beyond the vulnerable component's security authority. Adobe published details in security advisory APSB26-98.

Critical Impact
Successful exploitation allows script execution in the victim's browser session, enabling session token theft, unauthorized actions within AEM, and cross-origin data access due to the scope-changed condition.

Affected Products

Adobe Experience Manager (AEM)
Refer to Adobe advisory APSB26-98 for specific affected versions
Deployments exposing vulnerable AEM components to authenticated users

Discovery Timeline

2026-09-08 - CVE-2026-75629 published to the National Vulnerability Database (NVD)
2026-09-09 - Last updated in the NVD database

Technical Details for CVE-2026-75629

Vulnerability Analysis

CVE-2026-75629 is a DOM-based Cross-Site Scripting flaw [CWE-79] in Adobe Experience Manager. Unlike reflected or stored XSS, DOM-based XSS executes entirely within the client browser. The vulnerability arises when client-side JavaScript writes attacker-controlled data into a sink such as innerHTML, document.write, or eval without proper sanitization. The scope change indicates that exploitation crosses a security boundary. An attacker can leverage the executed script to access data outside the vulnerable component, including other origins or elevated user contexts.

Root Cause

The root cause is improper neutralization of input during web page generation on the client side. AEM JavaScript consumes untrusted data from a DOM source, such as location.hash, location.search, or postMessage, and passes it to a rendering sink without encoding or validation. This allows attacker-supplied strings to be interpreted as executable script.

Attack Vector

The attack requires low privileges and user interaction over the network. An authenticated AEM user must visit a URL containing a malicious fragment or query parameter crafted by the attacker. The vulnerable client-side code processes the payload and injects it into the DOM, triggering script execution. The attacker can then perform actions on behalf of the victim, exfiltrate session data, or pivot to other authenticated resources within the browser context.

No public proof-of-concept code is available. Consult the Adobe Security Advisory APSB26-98 for vendor-supplied technical details.

Detection Methods for CVE-2026-75629

Indicators of Compromise

HTTP requests to AEM endpoints containing suspicious URL fragments with JavaScript keywords such as javascript:, <script>, onerror=, or encoded variants
Unexpected outbound requests from user browsers to attacker-controlled domains following AEM page visits
Anomalous session activity, including actions performed outside typical user workflow patterns
Browser console errors or Content Security Policy (CSP) violations logged during AEM sessions

Detection Strategies

Deploy web application firewall (WAF) rules that inspect URL parameters and fragments for XSS payload signatures targeting AEM paths
Enable and monitor Content Security Policy violation reports to identify script execution attempts
Correlate AEM access logs with user-agent and referrer anomalies indicating redirection from external phishing pages

Monitoring Recommendations

Log all AEM administrative and author interface access with full URL capture, including fragments where possible
Monitor for privileged AEM user sessions originating from suspicious geographies or new devices
Track CSP report-uri endpoints and forward violations to the security information and event management (SIEM) platform for correlation

How to Mitigate CVE-2026-75629

Immediate Actions Required

Apply the security update referenced in Adobe advisory APSB26-98 to all AEM instances
Restrict AEM author and administrative interface access to trusted networks and VPN users only
Enforce a strict Content Security Policy that blocks inline scripts and restricts script sources
Educate AEM users to avoid clicking untrusted links, particularly those containing unusual URL fragments

Patch Information

Adobe released a patch addressing CVE-2026-75629 as documented in Adobe Security Advisory APSB26-98. Administrators should identify their AEM version, review the advisory for the corresponding fixed release, and schedule an update through standard change management processes.

Workarounds

Implement a strict Content Security Policy header with script-src 'self' to limit unauthorized script execution
Deploy WAF rules blocking common DOM XSS payloads on AEM URLs pending patch deployment
Reduce the number of accounts with author-level or higher privileges in AEM to limit exploitation surface

bash

# Example Content Security Policy header for AEM dispatcher
Header always set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; report-uri /csp-report"