CVE-2026-75743: Adobe Experience Manager Forms JEE CSRF Vulnerability

CVE-2026-75743 Overview

CVE-2026-75743 is a Cross-Site Request Forgery (CSRF) vulnerability affecting Adobe Experience Manager (AEM) Forms JEE. The flaw allows an attacker to bypass security controls and obtain unauthorized write access to the application. Successful exploitation requires user interaction, specifically that an authenticated victim visits a malicious URL or interacts with a compromised web page. The issue is tracked under CWE-352: Cross-Site Request Forgery and is documented in Adobe Security Advisory APSB26-151.

Critical Impact
Attackers can forge authenticated requests to bypass security features, achieve unauthorized write access, and cause limited availability disruption within AEM Forms JEE deployments.

Affected Products

Adobe Experience Manager Forms JEE (see APSB26-151 for affected versions)

Discovery Timeline

2026-09-22 - CVE-2026-75743 published to NVD
2026-09-22 - Last updated in NVD database

Technical Details for CVE-2026-75743

Vulnerability Analysis

CVE-2026-75743 stems from insufficient CSRF protection within AEM Forms JEE request handlers. The application accepts state-changing requests without validating an anti-CSRF token bound to the user session. An attacker can craft a malicious HTML page or URL that triggers a request against an AEM Forms JEE endpoint. When an authenticated administrator or authorized user visits the attacker-controlled resource, the browser transmits session cookies alongside the forged request. The server processes the request as legitimate, enabling write actions the attacker could not otherwise perform. The impact is scoped to integrity (high) and availability (low), with no direct data disclosure.

Root Cause

The root cause is a missing or improperly enforced CSRF token check on sensitive endpoints within AEM Forms JEE. Endpoints performing state-changing operations rely on ambient session authentication without verifying request origin or token validity, which violates the CWE-352 protection model.

Attack Vector

Exploitation occurs over the network and requires user interaction. An attacker delivers a phishing link, hosts a malicious page, or compromises a trusted site that a logged-in AEM Forms JEE user visits. The victim's browser automatically issues the forged request against the AEM application using the victim's active session. No credentials or prior privileges are required by the attacker.

No public proof-of-concept exploit code has been released. Refer to Adobe Security Advisory APSB26-151 for vendor technical details.

Detection Methods for CVE-2026-75743

Indicators of Compromise

Unexpected write operations, configuration changes, or form submissions originating from privileged user sessions during external browsing activity.
HTTP requests to AEM Forms JEE endpoints containing a Referer or Origin header pointing to an untrusted external domain.
Web server access logs showing state-changing POST or PUT requests missing the expected anti-CSRF token parameter.

Detection Strategies

Inspect AEM access logs for POST, PUT, and DELETE requests correlated with unusual Referer values or unfamiliar user-agent strings.
Deploy Web Application Firewall (WAF) rules that flag AEM Forms JEE state-changing requests lacking valid CSRF tokens.
Correlate endpoint browser telemetry with AEM server-side authentication events to identify sessions initiating requests immediately after visiting external URLs.

Monitoring Recommendations

Enable verbose auditing on AEM Forms JEE administrative endpoints and stream logs to a centralized SIEM.
Alert on out-of-hours administrative changes and on repeated failed CSRF token validations.
Track privileged user browsing patterns to detect visits to newly registered or low-reputation domains prior to AEM configuration changes.

How to Mitigate CVE-2026-75743

Immediate Actions Required

Apply the security update referenced in Adobe Security Advisory APSB26-151 to all AEM Forms JEE instances.
Restrict administrative access to AEM Forms JEE to trusted networks or through VPN, limiting exposure to external CSRF payloads.
Enforce short session lifetimes and require re-authentication for sensitive operations.

Patch Information

Adobe has released patched versions of AEM Forms JEE addressing CVE-2026-75743. Administrators must consult APSB26-151 for the specific fixed builds applicable to their deployment and install the update following Adobe's upgrade guidance.

Workarounds

Enforce SameSite=Strict or SameSite=Lax attributes on AEM session cookies to block cross-origin credential submission.
Deploy WAF rules that validate Origin and Referer headers on state-changing AEM Forms JEE endpoints and reject mismatched requests.
Instruct privileged AEM users to isolate administrative browsing sessions from general web activity until patching is complete.

bash

# Example WAF rule concept: reject state-changing AEM requests with foreign Origin
SecRule REQUEST_METHOD "@rx ^(POST|PUT|DELETE)$" \
  "chain,deny,status:403,id:1075743,msg:'AEM Forms JEE CSRF block'"
  SecRule REQUEST_HEADERS:Origin "!@beginsWith https://aem.internal.example.com"