CVE-2025-11439: JhumanJ OpnForm Authorization Bypass Flaw

CVE-2025-11439 Overview

CVE-2025-11439 is a missing authorization vulnerability in JhumanJ OpnForm versions up to and including 1.9.3. The flaw resides in the /show/integrations endpoint, which fails to enforce proper access controls on requests. A remote attacker with low-level authenticated access can manipulate requests to reach functionality that should be restricted. The vulnerability is tracked under CWE-862: Missing Authorization. Public disclosure of exploit details has occurred, and the maintainer has published a patch identified by commit hash 11d97d78f2de2cb49f79baed6bde8b611ec1f384. Administrators running OpnForm should apply the upstream fix to prevent unauthorized access to integration data.

Critical Impact

Remote authenticated attackers can bypass authorization checks on the /show/integrations endpoint in OpnForm, potentially exposing integration configuration data.

Affected Products

• JhumanJ OpnForm versions up to and including 1.9.3
• Self-hosted OpnForm deployments exposing the /show/integrations endpoint
• OpnForm instances with authenticated low-privileged user accounts

Discovery Timeline

• 2025-10-08 - CVE-2025-11439 published to the National Vulnerability Database
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-11439

Vulnerability Analysis

OpnForm is an open-source form builder maintained by JhumanJ. The application exposes an internal endpoint at /show/integrations that returns integration-related data for forms. In vulnerable releases, this endpoint does not validate whether the requesting user is authorized to view the requested integration resource. An attacker holding a low-privilege authenticated session can call the endpoint and retrieve data that should belong to another form or tenant. The issue is a classic missing authorization defect where authentication is required, but per-object access control is absent. Because the endpoint is reachable over the network with low attack complexity, exploitation does not require special conditions or user interaction.

Root Cause

The root cause is the absence of an authorization check within the controller handling /show/integrations. The endpoint relies on authentication alone and does not verify that the authenticated user owns or has permission to view the targeted resource. This aligns with CWE-862 Missing Authorization, where a security-relevant action is performed without confirming the actor has the required rights. The upstream fix in commit 11d97d78f2de2cb49f79baed6bde8b611ec1f384 introduces the missing authorization enforcement.

Attack Vector

An attacker authenticates to an OpnForm instance with any valid low-privilege account. The attacker then issues an HTTP request to /show/integrations referencing an object identifier belonging to another user or workspace. Because the endpoint skips the ownership check, OpnForm returns integration information the attacker should not see. No user interaction is required, and the attack is fully remote. Exploit details have been made public, lowering the barrier for opportunistic abuse. See the upstream patch commit for the exact code path affected.

// No verified proof-of-concept code is published in the referenced advisories.
// Refer to the vendor commit for the exact controller and access-check logic.

Detection Methods for CVE-2025-11439

Indicators of Compromise

• Unexpected HTTP GET requests to the /show/integrations path originating from low-privilege user sessions
• Access patterns where a single authenticated account enumerates multiple integration resource identifiers in a short time window
• Application logs showing successful /show/integrations responses to users who do not own the referenced form

Detection Strategies

• Enable verbose access logging on the OpnForm web tier and forward logs to a centralized analytics platform for correlation
• Compare the authenticated user identifier against the owner of each returned integration object to flag mismatches
• Alert on sequential requests to /show/integrations with incrementing or enumerated resource identifiers, which suggests scraping

Monitoring Recommendations

• Baseline normal request volume to /show/integrations per user and alert on statistical outliers
• Review authentication logs for newly created low-privilege accounts followed by immediate integration endpoint access
• Integrate OpnForm application logs with your SIEM to retain evidence for incident response and audit

How to Mitigate CVE-2025-11439

Immediate Actions Required

• Upgrade OpnForm to a release that includes commit 11d97d78f2de2cb49f79baed6bde8b611ec1f384 from pull request #900
• Audit existing user accounts and disable inactive or unnecessary low-privilege accounts that could be used to exploit the endpoint
• Review recent application logs for suspicious access to /show/integrations and rotate any integration secrets that may have been exposed

Patch Information

The maintainer has committed the fix as 11d97d78f2de2cb49f79baed6bde8b611ec1f384 in the OpnForm repository. The change adds the missing authorization enforcement on the /show/integrations handler. Deploy the patched build to all OpnForm instances and restart the application to load the corrected controller logic. Full details are available in the vendor commit and the VulDB entry #327376.

Workarounds

• Place OpnForm behind a reverse proxy or web application firewall and restrict /show/integrations to trusted internal networks until the patch is applied
• Temporarily disable self-service registration to prevent unauthenticated attackers from obtaining the low-privilege account required for exploitation
• Enforce short session lifetimes and multi-factor authentication to raise the cost of acquiring a usable session token

# Example nginx snippet to restrict the vulnerable endpoint to an internal CIDR
location /show/integrations {
    allow 10.0.0.0/8;
    deny all;
    proxy_pass http://opnform_upstream;
}