CVE-2026-75706: Adobe Experience Manager XSS Vulnerability

CVE-2026-75706 Overview

Adobe Experience Manager (AEM) contains a DOM-based Cross-Site Scripting (XSS) vulnerability tracked as CVE-2026-75706. An attacker can manipulate the Document Object Model (DOM) environment to execute arbitrary JavaScript in the victim's browser session. Exploitation requires user interaction: the victim must visit a crafted webpage. The flaw carries a changed scope, meaning malicious script execution can affect resources beyond the vulnerable component's security authority. Adobe published security advisory APSB26-98 addressing this issue across AEM Cloud Service and AEM 6.5 LTS releases.

Critical Impact
Successful exploitation allows attackers to execute malicious JavaScript in an authenticated user's browser context, enabling session hijacking, data theft, and unauthorized actions within AEM.

Affected Products

Adobe Experience Manager (on-premise)
Adobe Experience Manager Cloud Service
Adobe Experience Manager 6.5 LTS (including SP1 and SP2)

Discovery Timeline

2026-09-08 - CVE-2026-75706 published to the National Vulnerability Database
2026-09-10 - Last updated in NVD database

Technical Details for CVE-2026-75706

Vulnerability Analysis

CVE-2026-75706 is a DOM-based Cross-Site Scripting flaw [CWE-79] in Adobe Experience Manager. DOM-based XSS occurs entirely on the client side. The vulnerable JavaScript in AEM reads attacker-controlled data from a DOM source and writes it to a dangerous sink without proper sanitization or encoding.

Because execution takes place in the browser, the malicious payload never needs to reach the server in a reflected form. Attackers craft URLs or web content that manipulates the DOM environment to trigger script execution when the victim loads the page. Authentication to AEM is required, and the victim must interact with the crafted content.

The scope-changed classification indicates the injected script can influence resources outside the vulnerable component's security context, such as parent frames, adjacent AEM applications, or authenticated sessions. This raises the impact beyond a typical same-origin XSS.

Root Cause

The root cause is unsafe handling of untrusted input within client-side JavaScript executed by AEM. Data flows from a DOM source (for example, location.hash, document.referrer, or postMessage payloads) into a sink that interprets strings as executable code or HTML, such as innerHTML, document.write, or eval. Missing contextual output encoding permits the browser to parse attacker-supplied strings as script.

Attack Vector

The attack vector is network-based with low attack complexity and low privileges required. An authenticated AEM user must be lured to a crafted webpage or click a malicious link that manipulates the DOM. Once the payload executes, the attacker inherits the victim's AEM session context and can perform actions such as reading page content, exfiltrating tokens, or issuing authenticated requests. See the Adobe Security Advisory APSB26-98 for vendor-provided technical details.

Detection Methods for CVE-2026-75706

Indicators of Compromise

Anomalous URL fragments or query parameters targeting AEM authoring or publish instances containing script keywords such as <script>, javascript:, onerror=, or onload=.
Unexpected outbound requests from authenticated AEM sessions to untrusted third-party domains, indicating potential data exfiltration.
Browser console errors or Content Security Policy (CSP) violation reports originating from AEM pages.

Detection Strategies

Deploy web application firewall (WAF) rules that inspect request URIs and fragments for common DOM XSS payload patterns targeting AEM endpoints.
Enable and monitor CSP report-only or enforcement headers on AEM to surface unauthorized inline script execution.
Review AEM access logs for suspicious referrers and correlate with user session activity to identify targeted phishing attempts.

Monitoring Recommendations

Instrument client-side error monitoring on AEM-hosted properties to detect abnormal JavaScript execution paths.
Track authentication events and privileged actions performed shortly after users visit external links to identify session abuse.
Ingest AEM dispatcher and access logs into a centralized analytics platform to enable retrospective hunting for exploit patterns.

How to Mitigate CVE-2026-75706

Immediate Actions Required

Apply the security updates listed in Adobe Security Advisory APSB26-98 to all AEM on-premise, Cloud Service, and 6.5 LTS deployments.
Inventory AEM instances, including SP1 and SP2 of the 6.5 LTS branch, to confirm patch coverage across authoring and publish tiers.
Educate authenticated AEM authors and administrators about the risk of clicking untrusted links while signed in.

Patch Information

Adobe has released fixed builds for Adobe Experience Manager Cloud Service and Adobe Experience Manager 6.5 LTS. Consult the Adobe Security Advisory APSB26-98 for the specific fixed versions and update instructions relevant to each deployment model.

Workarounds

Enforce a strict Content Security Policy on AEM instances to restrict inline script execution and limit permitted script sources.
Configure the AEM dispatcher to filter suspicious query parameters and fragments before requests reach publish instances.
Restrict AEM authoring interface access to trusted networks or VPN-only routes to reduce exposure to opportunistic exploitation.

bash

# Example dispatcher filter to block common XSS payload patterns
/0100 { /type "deny" /url '(?i)(<script|javascript:|onerror=|onload=)' }