CVE-2026-48250: Adobe Experience Manager XSS Vulnerability

CVE-2026-48250 Overview

CVE-2026-48250 is a DOM-based Cross-Site Scripting (XSS) vulnerability affecting Adobe Experience Manager (AEM). The flaw exists in AEM versions 6.5.24, LTS SP1, 2026.04, and earlier releases. An attacker can manipulate the Document Object Model (DOM) to execute arbitrary JavaScript within the victim's browser session. Successful exploitation requires the victim to visit a crafted webpage, and the vulnerability has a changed scope component, meaning impact extends beyond the vulnerable component itself. The issue is tracked under [CWE-79] and disclosed through Adobe Security Advisory APSB26-56.

Critical Impact
Attackers can execute malicious JavaScript in a victim's browser context, enabling session hijacking, credential theft, and unauthorized actions across other components due to the changed scope.

Affected Products

Adobe Experience Manager 6.5.24 and earlier
Adobe Experience Manager LTS SP1 and earlier
Adobe Experience Manager Cloud Service 2026.04 and earlier

Discovery Timeline

2026-06-09 - CVE-2026-48250 published to NVD
2026-06-10 - Last updated in NVD database

Technical Details for CVE-2026-48250

Vulnerability Analysis

The vulnerability is a DOM-based Cross-Site Scripting issue in Adobe Experience Manager. DOM-based XSS occurs when client-side JavaScript reads attacker-controlled data from a source such as location.hash, document.URL, or window.name, and passes it to a dangerous sink like innerHTML, document.write, or eval without proper sanitization.

Because the attack occurs entirely in the browser, the malicious payload may never reach the server, which complicates server-side identification. The changed scope indicator means that exploitation in one security context can affect resources or components managed by a different security authority. This amplifies the reach of an otherwise client-side flaw.

The attacker requires low privileges and user interaction. A victim must follow a crafted link or visit a malicious page that triggers the vulnerable client-side code path in AEM.

Root Cause

The root cause is improper neutralization of input during web page generation, classified as [CWE-79]. AEM's client-side scripts process attacker-influenced DOM properties and inject them into the page without contextual output encoding. Adobe has not released full technical details of the vulnerable code path. Refer to the Adobe Security Advisory APSB26-56 for vendor-confirmed information.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker crafts a URL containing a malicious JavaScript payload in a DOM source such as the URL fragment. The attacker then lures an authenticated AEM user, typically through phishing or a watering-hole campaign, to visit the page. The vulnerable client-side code reads the payload and writes it to a sink that executes script in the victim's browser. The script then runs with the privileges of the authenticated AEM session.

No verified proof-of-concept code is publicly available for CVE-2026-48250. The exploitation mechanism in prose: attacker-controlled DOM data flows into a JavaScript sink without sanitization, resulting in script execution in the AEM origin.

Detection Methods for CVE-2026-48250

Indicators of Compromise

Unusual outbound requests from authenticated AEM user browsers to attacker-controlled domains carrying session tokens or cookies.
AEM access logs showing requests to AEM pages followed by suspicious referrer headers or unusual URL fragments containing encoded JavaScript.
Browser console errors or content security policy violations originating from AEM-hosted pages.

Detection Strategies

Inspect web server and reverse proxy logs for URLs containing JavaScript keywords (javascript:, onerror=, <script>) in query strings or fragments targeting AEM endpoints.
Deploy a Content Security Policy (CSP) in report-only mode to surface unexpected inline script execution within AEM pages.
Use web application firewalls (WAF) to identify reflected and DOM-XSS payload patterns in HTTP requests to AEM hosts.

Monitoring Recommendations

Monitor AEM author and publish instance access logs for anomalous request patterns associated with content authors and administrators.
Track session cookie usage from multiple IPs or user agents for the same AEM account, indicating possible session theft.
Enable browser-side telemetry, where available, to capture script execution and DOM modifications on AEM-hosted pages.

How to Mitigate CVE-2026-48250

Immediate Actions Required

Apply Adobe's security update referenced in Adobe Security Advisory APSB26-56 to all affected AEM instances.
Inventory all AEM deployments, including on-premises 6.5.x, LTS, and Cloud Service environments, and confirm patch status.
Educate AEM authors and administrators about phishing links that target authenticated sessions.

Patch Information

Adobe has released fixed versions addressing CVE-2026-48250. Customers must upgrade Adobe Experience Manager beyond 6.5.24, apply the patch superseding LTS SP1, or move to the AEM Cloud Service release after 2026.04. Refer to the Adobe Security Advisory APSB26-56 for exact patched build numbers and download locations.

Workarounds

Enforce a strict Content Security Policy on AEM-hosted sites to block inline script execution and limit script sources to trusted origins.
Restrict access to AEM author instances to trusted networks or VPN-only access to reduce exposure of authenticated sessions.
Configure short session timeouts and require re-authentication for sensitive operations to limit the window of session abuse.

bash

# Example Content Security Policy header to harden AEM responses
# Apply at the dispatcher or reverse proxy layer
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'"