CVE-2026-47946: Adobe Experience Manager XSS Vulnerability

CVE-2026-47946 Overview

CVE-2026-47946 is a DOM-based Cross-Site Scripting (XSS) vulnerability [CWE-79] 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 context. Exploitation requires user interaction: the victim must visit an attacker-crafted webpage. The scope is changed, meaning the impact extends beyond the vulnerable component to other security boundaries. Adobe published security advisory APSB26-56 to address this issue.

Critical Impact

Successful exploitation allows attackers to execute malicious JavaScript in the victim's browser session, potentially leading to session token theft, defacement, or actions performed on behalf of the authenticated user.

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-2026-47946 published to the National Vulnerability Database
• 2026-06-10 - Last updated in NVD database

Technical Details for CVE-2026-47946

Vulnerability Analysis

The vulnerability is a DOM-based Cross-Site Scripting flaw classified under [CWE-79]: Improper Neutralization of Input During Web Page Generation. Unlike reflected or stored XSS, DOM-based XSS executes entirely within the client-side script logic. The malicious payload never needs to traverse the server, making server-side filtering ineffective against this class of attack.

AEM client-side JavaScript processes attacker-influenced data sources such as document.location, document.URL, or document.referrer without proper sanitization. The unsanitized data is then written into a DOM sink such as innerHTML, document.write(), or eval(), causing the browser to interpret attacker-supplied content as executable script.

The scope change indicates the executed script can affect resources beyond the vulnerable component, such as accessing cookies or DOM elements belonging to other origins or privileged AEM administration interfaces.

Root Cause

The root cause is improper neutralization of user-controllable input in client-side JavaScript within Adobe Experience Manager. AEM components fail to encode or validate data sourced from the DOM environment before passing it to a sink capable of executing script. Authentication is required for exploitation, indicating the affected functionality sits behind an authenticated AEM endpoint.

Attack Vector

An attacker with low-privileged access to AEM crafts a URL or webpage containing a malicious payload designed to influence the DOM. The attacker then convinces a victim, typically an authenticated AEM user, to visit the crafted page. When the victim's browser processes the page, the AEM client-side code reads the attacker-controlled DOM property and writes it into an executable sink. The injected JavaScript runs with the privileges of the victim's AEM session.

No verified exploitation code is publicly available. Refer to the Adobe Experience Manager Security Advisory APSB26-56 for vendor-supplied technical details.

Detection Methods for CVE-2026-47946

Indicators of Compromise

• Unexpected outbound HTTP requests from administrator browsers to attacker-controlled domains following AEM page visits
• AEM access logs showing authenticated sessions accessing crafted URLs with unusual fragment identifiers, hash parameters, or encoded JavaScript payloads
• Browser console errors referencing script execution from unexpected origins within AEM authoring or publishing interfaces

Detection Strategies

• Inspect AEM request logs for URL parameters and fragments containing patterns such as javascript:, <script>, onerror=, or hex/URL-encoded equivalents
• Deploy a Content Security Policy (CSP) in report-only mode to identify inline script execution attempts within AEM pages
• Correlate user authentication events with subsequent anomalous DOM activity or session token reuse from unfamiliar IP addresses

Monitoring Recommendations

• Enable verbose logging on AEM Dispatcher and application tiers to capture full request URIs, including query strings and referrers
• Monitor for AEM sessions performing privileged operations immediately after visiting external referrers
• Forward AEM web server and application logs to a centralized analytics platform for retention and behavioral analysis

How to Mitigate CVE-2026-47946

Immediate Actions Required

• Apply the security updates documented in Adobe security bulletin APSB26-56 to all AEM instances, including authoring, publishing, and Dispatcher tiers
• Inventory all AEM deployments and confirm version levels against the affected list, prioritizing internet-exposed instances
• Rotate AEM administrator credentials and invalidate active sessions following patch deployment

Patch Information

Adobe released fixed versions addressing CVE-2026-47946. Customers running Adobe Experience Manager 6.5.24, LTS SP1, 2026.04, or earlier must upgrade to the patched releases referenced in the Adobe Experience Manager Security Advisory APSB26-56. AEM as a Cloud Service customers should ensure their environment is updated to the latest available release.

Workarounds

• Restrict access to AEM authoring instances to trusted network segments using firewall rules or VPN-gated access
• Implement a strict Content Security Policy that disallows inline script execution and restricts script sources to known origins
• Train AEM users to avoid clicking untrusted links while authenticated to the AEM console, since exploitation requires user interaction

# Example CSP header to limit DOM-based XSS impact on AEM responses
# Configure within the AEM Dispatcher or fronting web server
Header always set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'"