CVE-2026-75681: Adobe Experience Manager XSS Vulnerability

CVE-2026-75681 Overview

Adobe Experience Manager (AEM) contains a DOM-based Cross-Site Scripting (XSS) vulnerability tracked as CVE-2026-75681. An attacker can manipulate the Document Object Model (DOM) environment to execute malicious JavaScript in the victim's browser context. Exploitation requires user interaction because the victim must visit a crafted webpage. The scope is changed, meaning the vulnerable component can impact resources beyond its own security scope. The issue is categorized under CWE-79 (Improper Neutralization of Input During Web Page Generation).

Critical Impact
An authenticated attacker can execute arbitrary JavaScript in a victim's browser session, enabling session compromise, unauthorized actions, and cross-origin data exposure within AEM-hosted content.

Affected Products

Adobe Experience Manager (on-premise, all versions prior to the fixed release)
Adobe Experience Manager Cloud Service (AEM CS)
Adobe Experience Manager 6.5 LTS (including SP1 and SP2)

Discovery Timeline

2026-09-08 - CVE-2026-75681 published to the National Vulnerability Database (NVD)
2026-09-10 - Last updated in NVD database

Technical Details for CVE-2026-75681

Vulnerability Analysis

CVE-2026-75681 is a DOM-based Cross-Site Scripting flaw in Adobe Experience Manager. Unlike reflected or stored XSS, DOM-based XSS occurs entirely in the client-side script when untrusted data flows from a controllable source into a dangerous sink without proper sanitization. Common sources include document.location, document.URL, and window.name. Common sinks include innerHTML, document.write, and eval.

The attacker crafts a URL or webpage that manipulates the DOM environment used by an AEM page or component. When a victim visits the crafted page, the malicious payload is parsed and executed by the browser. Because the scope is changed, the injected script can affect resources beyond the vulnerable component itself.

Root Cause

The root cause is improper neutralization of user-controlled input reaching a client-side script sink within AEM. Client-side JavaScript writes attacker-influenced values into the DOM without escaping or validation, allowing arbitrary script execution.

Attack Vector

Exploitation is network-based and requires low-privileged authenticated access plus user interaction. An attacker delivers a crafted link or hosts a malicious page referencing the vulnerable AEM endpoint. When a logged-in AEM user visits the page, JavaScript executes under the AEM origin, enabling session token theft, content manipulation, and forged administrative actions.

No verified public proof-of-concept is available. Refer to the Adobe Security Advisory APSB26-98 for vendor technical details.

Detection Methods for CVE-2026-75681

Indicators of Compromise

Unusual outbound requests from browser sessions to attacker-controlled domains originating from AEM author or publish hosts.
Web server logs containing requests with encoded JavaScript payloads or fragment identifiers targeting AEM endpoints and components.
Unexpected DOM modifications, injected <script> tags, or inline event handlers observed in cached AEM responses.

Detection Strategies

Deploy a Web Application Firewall (WAF) rule set that inspects query strings, URL fragments, and referrer values for XSS signatures targeting AEM paths.
Enable and monitor Content Security Policy (CSP) violation reports to surface unauthorized inline script execution.
Correlate authentication events with anomalous administrative activity in AEM audit logs to detect session abuse following XSS delivery.

Monitoring Recommendations

Monitor AEM dispatcher and access logs for repeated requests containing DOM XSS payload patterns such as javascript:, onerror=, and <img variants.
Track user-agent and geolocation anomalies for privileged AEM accounts to identify session hijack attempts.
Alert on outbound HTTP requests from AEM-served pages to unknown third-party hosts, which may indicate exfiltration of stolen tokens.

How to Mitigate CVE-2026-75681

Immediate Actions Required

Apply the security update referenced in Adobe Security Advisory APSB26-98 to all affected AEM instances, including on-premise, Cloud Service, and 6.5 LTS deployments.
Restrict access to AEM author instances to trusted networks and enforce multi-factor authentication (MFA) for content authors and administrators.
Review AEM audit logs for suspicious authentication events or configuration changes since the vulnerability disclosure date.

Patch Information

Adobe published security bulletin APSB26-98 addressing CVE-2026-75681. Customers running AEM Cloud Service receive the fix automatically. On-premise and AEM 6.5 LTS customers must install the vendor-supplied update. See the Adobe Security Advisory APSB26-98 for exact version guidance and installation steps.

Workarounds

Enforce a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins.
Configure the AEM Dispatcher to filter and sanitize request parameters before they reach publish instances.
Train content authors and administrators to avoid clicking untrusted links while authenticated to AEM.

bash

# Example Dispatcher filter to block suspicious query patterns
/0100 { /type "deny" /url '*<script*' }
/0101 { /type "deny" /url '*javascript:*' }
/0102 { /type "deny" /url '*onerror=*' }