CVE-2026-75744: Adobe Experience Manager Forms XSS Vulnerability

CVE-2026-75744 Overview

Adobe Experience Manager (AEM) Forms JEE contains a stored Cross-Site Scripting (XSS) vulnerability tracked as CVE-2026-75744. An authenticated high-privileged attacker can inject malicious JavaScript into vulnerable form fields. The payload executes in a victim's browser when they view the affected page. Successful exploitation can lead to session hijacking, account takeover, or elevated access within the AEM environment. The vulnerability carries a scope change, meaning the impact extends beyond the vulnerable component to other browser contexts.

Critical Impact
Attackers can execute arbitrary JavaScript in victim browsers, hijack authenticated sessions, and pivot to higher-privileged accounts within Adobe Experience Manager Forms JEE.

Affected Products

Adobe Experience Manager Forms JEE
Refer to Adobe Security Advisory APSB26-151 for affected version ranges
Deployments where AEM Forms JEE is exposed to authenticated users

Discovery Timeline

2026-09-22 - CVE-2026-75744 published to the National Vulnerability Database (NVD)
2026-09-22 - Last updated in NVD database

Technical Details for CVE-2026-75744

Vulnerability Analysis

The vulnerability is a stored Cross-Site Scripting flaw classified under [CWE-79]. Stored XSS occurs when user-supplied input is persisted server-side and later rendered in a browser without proper encoding or sanitization. In AEM Forms JEE, specific form fields fail to neutralize script content submitted by high-privileged users. The injected payload executes each time another user loads the affected page, running in the security context of the AEM origin. Because scope is changed, the payload can affect resources outside the vulnerable component, including administrative UIs or embedded iframes.

Root Cause

The root cause is improper neutralization of input during web page generation. AEM Forms JEE stores attacker-controlled field values and later reflects them into rendered HTML without contextual output encoding. Any embedded <script> blocks, event handlers, or JavaScript URIs execute when parsed by the browser.

Attack Vector

Exploitation requires a network-reachable AEM Forms JEE instance and authenticated access with high privileges. The attacker submits a form field containing JavaScript, and the malicious content persists in the backend datastore. A victim, typically another administrator or reviewer, loads the page containing the tainted field and triggers script execution. User interaction is required, so the payload commonly targets workflows where privileged users routinely open form submissions or configuration pages.

No verified exploit code is publicly available. See the Adobe Security Advisory APSB26-151 for vendor guidance.

Detection Methods for CVE-2026-75744

Indicators of Compromise

Form field values containing <script>, onerror=, onload=, or javascript: URI schemes stored in AEM repositories.
Unexpected outbound requests from administrator browsers to attacker-controlled domains after opening AEM Forms pages.
Newly created AEM accounts or privilege changes correlated with administrator sessions viewing suspicious form entries.

Detection Strategies

Review AEM Forms JEE audit logs for form field submissions containing HTML or JavaScript syntax from privileged accounts.
Deploy Content Security Policy (CSP) violation reporting to surface inline script execution attempts inside AEM origins.
Correlate authentication events with anomalous form submission activity from accounts holding administrative roles.

Monitoring Recommendations

Enable verbose logging on AEM Forms JEE form-submission endpoints and forward logs to a centralized SIEM for analysis.
Monitor for session token reuse across geographic locations, which may indicate hijacked administrator sessions.
Alert on modifications to AEM user permissions or role assignments performed within short windows after form-page access.

How to Mitigate CVE-2026-75744

Immediate Actions Required

Apply the security update referenced in Adobe Security Advisory APSB26-151 as soon as possible.
Audit AEM Forms JEE accounts and remove unnecessary high-privileged assignments to reduce exploitation prerequisites.
Review recent form submissions from privileged users for embedded scripts and purge tainted entries.

Patch Information

Adobe has released security updates addressing CVE-2026-75744. Refer to Adobe Security Bulletin APSB26-151 for the fixed version numbers and download instructions. Apply the patch across all AEM Forms JEE nodes, including author, publish, and dispatcher tiers.

Workarounds

Restrict AEM Forms JEE administrative interfaces to trusted networks using firewall or reverse-proxy access controls.
Enforce a strict Content Security Policy that blocks inline scripts and untrusted external script sources within AEM origins.
Require multi-factor authentication for all high-privileged AEM accounts to raise the cost of compromise.

bash

# Example Content-Security-Policy header for AEM dispatcher
Header always set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'"