CVE-2026-48262: Adobe Experience Manager XSS Vulnerability

CVE-2026-48262 Overview

CVE-2026-48262 is a DOM-based Cross-Site Scripting (XSS) vulnerability [CWE-79] affecting Adobe Experience Manager (AEM). An attacker can manipulate the Document Object Model (DOM) environment to execute malicious JavaScript within the context of a victim's browser session. Exploitation requires user interaction, specifically a victim visiting a crafted webpage. The scope is changed, meaning the vulnerable component impacts resources beyond its own security scope. Adobe published a security advisory tracking this issue as APSB26-74.

Critical Impact
Successful exploitation allows attackers to execute arbitrary JavaScript in the victim's browser, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of authenticated AEM users.

Affected Products

Adobe Experience Manager (on-premises)
Adobe Experience Manager Cloud Service (AEM CS)
Adobe Experience Manager 6.5 LTS (including SP1 and SP2)

Discovery Timeline

2026-07-14 - CVE-2026-48262 published to NVD
2026-07-17 - Last updated in NVD database

Technical Details for CVE-2026-48262

Vulnerability Analysis

CVE-2026-48262 is a DOM-based Cross-Site Scripting flaw in Adobe Experience Manager. Unlike reflected or stored XSS variants, DOM-based XSS occurs entirely on the client side. The malicious payload is processed by browser-side JavaScript that reads attacker-controlled data from a source such as document.location, document.URL, or window.name and writes it to a dangerous sink like innerHTML or document.write without proper sanitization.

The vulnerability affects Adobe Experience Manager on-premises, AEM Cloud Service, and AEM 6.5 LTS through Service Pack 2. An authenticated attacker with low privileges can craft a URL or webpage that triggers execution of injected JavaScript within the AEM application context. Because the scope is changed, the impact extends beyond the vulnerable component to affect other browser-side resources.

Root Cause

The root cause is improper neutralization of input during web page generation on the client side. AEM client-side scripts consume attacker-controlled DOM sources and insert the values into HTML sinks without proper encoding or validation, allowing injected scripts to execute in the victim's browser.

Attack Vector

Exploitation requires network access to the AEM instance, low-level privileges, and user interaction. The attacker must convince a victim, typically an authenticated AEM user, to visit a crafted webpage or click a specifically crafted URL. Once loaded, the vulnerable client-side code processes the malicious payload and executes attacker-supplied JavaScript in the victim's authenticated session context.

No public proof-of-concept exploit is currently available, and this CVE is not listed in the CISA Known Exploited Vulnerabilities catalog. Refer to the Adobe Experience Manager Security Advisory APSB26-74 for vendor-specific technical details.

Detection Methods for CVE-2026-48262

Indicators of Compromise

Unusual URL parameters or fragment identifiers containing JavaScript keywords such as <script>, javascript:, or event handlers like onerror= and onload= in AEM access logs.
Unexpected outbound HTTP requests originating from authenticated AEM user browser sessions to attacker-controlled domains.
Anomalous session activity such as content modifications, permission changes, or API calls performed shortly after a user visited an external link.

Detection Strategies

Enable and review AEM Dispatcher and web server logs for requests containing encoded script payloads targeting AEM authoring or publishing endpoints.
Deploy a Web Application Firewall (WAF) with signatures tuned to identify DOM XSS payload patterns and log blocked requests.
Correlate browser telemetry, referer headers, and downstream API activity to identify session abuse that follows suspicious page loads.

Monitoring Recommendations

Monitor authentication events and privileged AEM operations for actions that occur immediately following external link clicks.
Track Content Security Policy (CSP) violation reports from user browsers to identify blocked inline script execution attempts.
Alert on newly created AEM users, role changes, or content publication events performed by accounts outside normal working hours.

How to Mitigate CVE-2026-48262

Immediate Actions Required

Apply the patches referenced in Adobe security bulletin APSB26-74 to all affected Adobe Experience Manager instances, including on-premises, Cloud Service, and 6.5 LTS deployments.
Restrict AEM author and publish interface access to trusted networks or VPN-only connections until patching is complete.
Enforce a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins.

Patch Information

Adobe has released security updates addressing CVE-2026-48262. Refer to the Adobe Experience Manager Security Advisory APSB26-74 for the full list of fixed versions and installation instructions. Customers using AEM Cloud Service receive updates automatically through the managed service, while on-premises and 6.5 LTS operators must apply the update manually.

Workarounds

Configure a WAF or AEM Dispatcher filter to block requests containing suspicious characters such as <, >, and javascript: in URL parameters and fragments.
Implement HTTP security headers including Content-Security-Policy, X-Content-Type-Options: nosniff, and X-Frame-Options: DENY to reduce XSS exploitation impact.
Train AEM users to avoid clicking untrusted links while authenticated to the AEM console.

bash

# Example Content Security Policy header for AEM Dispatcher configuration
Header always set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'none'"
Header always set X-Content-Type-Options "nosniff"
Header always set X-Frame-Options "DENY"
Header always set Referrer-Policy "strict-origin-when-cross-origin"