CVE-2026-90599: Inventory Management System CSRF Vulnerability

CVE-2026-90599 Overview

CVE-2026-90599 is a cross-site request forgery (CSRF) vulnerability [CWE-352] affecting the Rizwan17 inventory-management-system project on GitHub. The flaw resides in an unspecified function within the includes/process.php file. An attacker can trigger unauthorized state-changing actions remotely by tricking an authenticated user into visiting a crafted page or link. A public proof-of-concept has been released, increasing the likelihood of opportunistic exploitation against exposed deployments. The project follows a rolling-release model, so no discrete affected or fixed version numbers are enumerated. The maintainer was notified through a GitHub issue but has not responded at the time of publication.

Critical Impact
An authenticated user visiting a malicious page can be coerced into performing unintended actions in the inventory-management-system, leading to limited integrity impact on application data.

Affected Products

Rizwan17 inventory-management-system (rolling release)
Commit 5e74a46b4b70623d0e4a0c9c4aee3bd1777185d2 and earlier
Vulnerable component: includes/process.php

Discovery Timeline

2026-09-13 - CVE-2026-90599 published to NVD
2026-09-14 - Last updated in NVD database

Technical Details for CVE-2026-90599

Vulnerability Analysis

The vulnerability is a classic cross-site request forgery weakness. The includes/process.php endpoint accepts state-changing HTTP requests without validating an anti-CSRF token, request origin, or referer. Any authenticated session cookie is automatically attached by the browser to a cross-origin request, allowing an attacker's page to submit actions on behalf of a logged-in victim. Exploitation requires user interaction, such as clicking a link or loading attacker-controlled content while authenticated to the application. Because the referenced proof-of-concept also demonstrates an insecure direct object reference in an updateUser flow, an attacker may be able to modify user records belonging to other accounts.

Root Cause

The root cause is the absence of CSRF protections in the includes/process.php handler. The application does not issue or verify per-session synchronizer tokens, does not enforce a SameSite cookie attribute, and does not validate the request origin. Any authenticated browser session becomes a confused deputy for the attacker.

Attack Vector

Exploitation is remote and requires the victim to be authenticated to the vulnerable application when they visit attacker-controlled content. The attacker hosts a page containing an auto-submitting HTML form or image tag targeting includes/process.php. When the victim's browser loads it, the request is sent with valid session credentials and processed by the application. The public proof-of-concept is available at the GitHub PoC Python Script and additional context is documented in GitHub Issue #17.

No verified vendor code example is available. Refer to the VulDB CVE-2026-90599 advisory for further technical detail.

Detection Methods for CVE-2026-90599

Indicators of Compromise

Unexpected POST requests to includes/process.php whose Referer or Origin headers point to external domains.
Unexplained modifications to user records, inventory entries, or account attributes performed by a legitimate user session.
Web server access logs showing bursts of state-changing requests immediately after a user clicks a third-party link.

Detection Strategies

Deploy web application firewall (WAF) rules that flag or block cross-origin POST requests to includes/process.php lacking a matching Origin header.
Correlate authentication events with subsequent write actions to surface sessions that perform sensitive operations without prior in-app navigation.
Hunt for browser session activity that lacks an expected GET request to a form-rendering page before a corresponding POST submission.

Monitoring Recommendations

Enable verbose HTTP logging on the web server hosting the application and retain Referer, Origin, and User-Agent fields.
Monitor administrative and user-management endpoints for anomalous request rates or off-hours activity.
Alert on any modification of privileged accounts that cannot be tied to a legitimate administrative workflow.

How to Mitigate CVE-2026-90599

Immediate Actions Required

Restrict access to the application to trusted networks or place it behind a VPN until a fix is available.
Advise users to log out of the application when not actively using it and to avoid clicking untrusted links while authenticated.
Set session cookies with SameSite=Strict or SameSite=Lax at the server or reverse proxy layer to reduce cross-site delivery of credentials.

Patch Information

No vendor patch is available. The project uses a rolling-release model, and the maintainer has not responded to GitHub Issue #17. Organizations running the Rizwan17 Inventory Management System should apply their own fix by adding anti-CSRF tokens to every state-changing request handled by includes/process.php and validating them server-side.

Workarounds

Add a synchronizer token pattern: generate a per-session CSRF token, embed it in every form, and validate it in includes/process.php before processing input.
Enforce origin validation by rejecting requests whose Origin or Referer header does not match the application's own host.
Configure the reverse proxy or web server to strip or reject cross-origin POST requests targeting sensitive endpoints.
Reduce session lifetime and require re-authentication for privileged actions such as user updates.

bash

# Example Apache configuration to block cross-origin POSTs to process.php
<Location "/includes/process.php">
    SetEnvIfNoCase Origin "^https?://your-app-host(:[0-9]+)?$" allowed_origin
    <RequireAll>
        Require method GET POST
        Require env allowed_origin
    </RequireAll>
    Header always set Set-Cookie "PHPSESSID=%{HTTP_COOKIE}e; SameSite=Strict; Secure; HttpOnly"
</Location>