CVE-2026-106628: Adobe Experience Manager DOM XSS Vulnerability

CVE-2026-106628 Overview

CVE-2026-106628 is a DOM-based Cross-Site Scripting (XSS) vulnerability affecting Adobe Experience Manager (AEM). An attacker can manipulate the Document Object Model (DOM) environment to execute arbitrary JavaScript within the victim's browser context. Exploitation requires user interaction: the victim must visit a crafted webpage. The scope is changed, meaning the exploited component can affect resources beyond its security authority. The weakness is classified under [CWE-79], Improper Neutralization of Input During Web Page Generation.

Critical Impact
An authenticated attacker can execute malicious JavaScript in a victim's browser, enabling session abuse, data exposure, and actions performed on behalf of the user across trusted origins.

Affected Products

Adobe Experience Manager (per Adobe Security Bulletin APSB26-152)
Refer to the vendor advisory for specific affected versions
Both AEM Cloud Service and on-premises AEM customers should consult the advisory

Discovery Timeline

2026-10-13 - CVE-2026-106628 published to the National Vulnerability Database
2026-10-14 - Last updated in NVD database

Technical Details for CVE-2026-106628

Vulnerability Analysis

Adobe Experience Manager processes client-side input that is reflected into the DOM without proper sanitization or encoding. An attacker crafts a URL or page fragment containing malicious JavaScript. When a victim loads the crafted content, client-side code writes attacker-controlled data to a sink such as innerHTML, document.write, or an event handler attribute. The browser then parses and executes the injected script within the AEM origin.

Because the Common Vulnerability Scoring System (CVSS) vector indicates a changed scope, successful exploitation can affect data or functionality outside the vulnerable component. The attacker gains the ability to read and modify content accessible to the victim's session.

Root Cause

The root cause is improper neutralization of untrusted input during web page generation [CWE-79]. Client-side JavaScript in AEM consumes attacker-controlled values and inserts them into DOM sinks without context-aware output encoding. This allows HTML and script content to be interpreted rather than treated as inert data.

Attack Vector

The attack is network-based and requires low privileges plus user interaction. An attacker lures an authenticated AEM user to a crafted webpage or crafted URL. The malicious payload is processed by vulnerable client-side logic, which writes it into the DOM. The injected script runs with the privileges of the victim within the AEM application context.

No verified public exploit code is available for this issue. Detailed technical analysis is published in the Adobe Security Bulletin APSB26-152.

Detection Methods for CVE-2026-106628

Indicators of Compromise

Unexpected <script> tags, javascript: URIs, or event handler attributes in AEM-rendered pages or stored content
Browser console errors or Content Security Policy (CSP) violations originating from AEM origins
Outbound requests from end-user browsers to unfamiliar domains immediately after visiting AEM-hosted URLs
Anomalous use of authenticated AEM session cookies from new IP addresses or user agents

Detection Strategies

Review web server and reverse proxy logs for URLs containing encoded script payloads, onerror=, onload=, or javascript: schemes targeting AEM endpoints
Deploy a strict CSP in report-only mode and collect report-uri events to surface injection attempts
Scan authored AEM content for script fragments introduced outside approved component templates

Monitoring Recommendations

Correlate authentication events with downstream API calls to detect session abuse following suspicious page loads
Monitor Web Application Firewall (WAF) logs for XSS signature matches against AEM request paths
Alert on administrative actions in AEM that occur without a corresponding interactive login workflow

How to Mitigate CVE-2026-106628

Immediate Actions Required

Apply the Adobe security updates referenced in APSB26-152 to all affected AEM instances
Restrict AEM author and admin access to trusted networks and enforce multi-factor authentication for privileged accounts
Advise content authors and administrators to avoid clicking untrusted links while logged into AEM

Patch Information

Adobe published fixes for this vulnerability in Security Bulletin APSB26-152. Administrators should consult the bulletin for the exact fixed versions corresponding to their deployment type, apply the update in a staging environment, validate functionality, and promote to production. AEM as a Cloud Service customers should confirm their service version includes the fix.

Workarounds

Enforce a strict Content Security Policy that disallows inline scripts and restricts script sources to vetted origins
Enable AEM Dispatcher filter rules to block requests containing script-like payloads or suspicious query parameters
Terminate idle AEM sessions aggressively and shorten authentication cookie lifetimes to limit exposure window

bash

# Example Content-Security-Policy header for AEM responses
Content-Security-Policy: default-src 'self'; \
  script-src 'self' https://trusted.cdn.example; \
  object-src 'none'; \
  base-uri 'self'; \
  frame-ancestors 'self'; \
  report-uri /csp-report