CVE-2026-47942 Overview
CVE-2026-47942 is a stored Cross-Site Scripting (XSS) vulnerability affecting Adobe Experience Manager (AEM) versions 6.5.24, LTS SP1, 2026.04, and earlier. A low-privileged authenticated attacker can inject malicious JavaScript into vulnerable form fields. The injected script executes in a victim's browser when the user navigates to the page containing the affected field. The vulnerability carries a changed scope, meaning the impact extends beyond the vulnerable component into other security boundaries. The flaw is tracked as CWE-79 and was published to NVD on 2026-06-09.
Critical Impact
Authenticated attackers with low privileges can execute arbitrary JavaScript in victims' browsers, enabling session theft, credential harvesting, and unauthorized actions within the AEM context.
Affected Products
- Adobe Experience Manager 6.5.24 and earlier
- Adobe Experience Manager LTS SP1 and earlier
- Adobe Experience Manager 2026.04 and earlier (including AEM Cloud Service)
Discovery Timeline
- 2026-06-09 - CVE-2026-47942 published to NVD
- 2026-06-10 - Last updated in NVD database
Technical Details for CVE-2026-47942
Vulnerability Analysis
The vulnerability resides in form field input handling within Adobe Experience Manager. AEM fails to properly sanitize or encode user-supplied input before storing it and rendering it back to other users. An authenticated attacker with low privileges submits crafted JavaScript payloads through vulnerable form fields. The malicious content persists in the AEM content repository.
When any user, including higher-privileged administrators, browses to a page that renders the stored content, the JavaScript executes in their browser session. The scope change indicates the vulnerability crosses a trust boundary. Exploitation requires user interaction, as the victim must visit the affected page for the payload to trigger.
The attack enables session token theft, forced administrative actions through CSRF chaining, content defacement, and credential phishing within the trusted AEM domain context.
Root Cause
The root cause is improper neutralization of input during web page generation, classified under CWE-79. AEM accepts script content in form fields without applying output encoding when rendering the data in HTML response contexts. The application trusts authenticated user input without enforcing context-aware sanitization on persisted data.
Attack Vector
The attack vector is network-based and requires authentication with low privileges plus victim interaction. An attacker authenticates to AEM with any account that has form submission rights. The attacker injects a JavaScript payload, such as a <script> block or event handler attribute, into a vulnerable form field. The payload is stored server-side. When a victim loads the page containing the stored content, the browser parses and executes the script under the AEM origin.
No verified public exploit code is available for this vulnerability. Refer to the Adobe Experience Manager Security Advisory for vendor technical details.
Detection Methods for CVE-2026-47942
Indicators of Compromise
- Unexpected <script> tags, JavaScript event handlers, or encoded payloads (e.g., javascript:, onerror=, onload=) stored in AEM form field content
- Outbound HTTP requests from administrator browsers to attacker-controlled domains shortly after viewing AEM-rendered pages
- Anomalous form submissions from low-privileged AEM accounts containing HTML or JavaScript syntax
- Unauthorized session activity originating from valid AEM administrator sessions
Detection Strategies
- Inspect AEM access logs and content repository entries for form submissions containing script tags, encoded HTML entities, or known XSS payload patterns
- Deploy Content Security Policy (CSP) headers in report-only mode to surface unexpected inline script execution
- Monitor browser-side errors and CSP violation reports tied to AEM-rendered pages
- Review user-generated content stored in JCR nodes for embedded HTML or JavaScript artifacts
Monitoring Recommendations
- Enable verbose request logging on AEM dispatcher and publish instances to capture form field payloads
- Correlate authentication events with subsequent form submissions to identify suspicious low-privileged accounts
- Forward AEM application logs to a centralized SIEM for pattern-based detection of XSS signatures
- Track DOM modifications and outbound network calls from administrator workstations accessing AEM
How to Mitigate CVE-2026-47942
Immediate Actions Required
- Apply the security updates referenced in Adobe Security Bulletin APSB26-56 to all AEM instances
- Audit existing form field content in the JCR repository for previously injected payloads and remove malicious entries
- Review and restrict form submission privileges to the minimum set of trusted users
- Rotate administrator session credentials if compromise is suspected
Patch Information
Adobe has released security updates addressing CVE-2026-47942. Refer to the Adobe Experience Manager Security Advisory APSB26-56 for fixed version details covering AEM 6.5, AEM LTS, and AEM Cloud Service. Upgrade affected on-premises deployments and confirm AEM Cloud Service tenants are running patched releases.
Workarounds
- Enforce a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins
- Configure AEM dispatcher rules to filter HTML and JavaScript syntax from form field submissions until patches are applied
- Disable or restrict access to vulnerable form components for low-privileged user groups
- Require multi-factor authentication for all AEM accounts to limit the pool of attackers who can submit stored payloads
# Example Content Security Policy header to limit XSS impact
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
