CVE-2026-87922: Inventory Management System Auth Bypass Flaw

CVE-2026-87922 Overview

CVE-2026-87922 is a missing authentication vulnerability in the Rizwan17 inventory-management-system project on GitHub. The flaw resides in the DBOperation.addCategory function within includes/process.php, part of the AJAX Backend component. An attacker can manipulate the userid argument to invoke the function without proper authentication, allowing unauthorized category operations from a remote source. The exploit code is publicly available, increasing the likelihood of opportunistic abuse. The project uses a rolling release model, so specific fixed version identifiers are not disclosed. The maintainer was notified through a GitHub issue but has not responded at the time of publication.

Critical Impact
Remote, unauthenticated attackers can invoke backend category-management functionality that should require authentication, affecting integrity, confidentiality, and availability of the inventory data.

Affected Products

Rizwan17 inventory-management-system up to commit bfe78a330d01bb26b9daec5dc9ecd5c77900e03f
Component: AJAX Backend, includes/process.php
Function: DBOperation.addCategory

Discovery Timeline

2026-09-09 - CVE-2026-87922 published to NVD
2026-09-09 - Last updated in NVD database

Technical Details for CVE-2026-87922

Vulnerability Analysis

The vulnerability is a Missing Authentication for Critical Function issue [CWE-287]. The DBOperation.addCategory handler in includes/process.php accepts a userid parameter over HTTP but does not verify that the caller possesses a valid authenticated session. As a result, a remote client can craft an AJAX request supplying an arbitrary userid value and have the backend perform category insertions on that user's behalf.

The function is reachable directly through the web-exposed AJAX endpoint. Because the application trusts the client-supplied userid rather than deriving identity from a server-side session token, authentication is effectively absent for this operation.

Root Cause

The root cause is reliance on a client-supplied identifier for authorization decisions. The addCategory code path in includes/process.php lacks a session validity check and does not confirm that the supplied userid corresponds to the authenticated principal. This design allows any network-reachable client to invoke backend database operations that should be gated behind login state and role checks.

Attack Vector

Exploitation requires only network access to the vulnerable endpoint. An attacker issues an HTTP POST to the AJAX handler mapping to DBOperation.addCategory, supplying a userid value and category fields. No credentials, tokens, or user interaction are required. Public exploit material is referenced by VulDB, so attack tooling is expected to circulate. See the GitHub Issue #10 Discussion and VulDB CVE-2026-87922 for additional technical context.

No verified proof-of-concept code has been reproduced here. Refer to the VulDB Vulnerability #401809 entry for exploitation details.

Detection Methods for CVE-2026-87922

Indicators of Compromise

Unauthenticated HTTP POST requests to includes/process.php containing an addCategory action and a userid parameter.
New rows in the category table with no corresponding authenticated session in web server or application logs.
Requests to the AJAX Backend originating from IP addresses without a preceding successful login event.

Detection Strategies

Correlate application logs with web-server access logs to identify calls to process.php that lack a valid session cookie or preceding authentication event.
Baseline normal request rates to the AJAX Backend and alert on anomalous bursts of addCategory operations.
Perform code-review or static analysis on includes/process.php to confirm the missing session check in DBOperation.addCategory.

Monitoring Recommendations

Enable verbose logging on the PHP application and forward web-server logs to a centralized analytics platform for query and retention.
Monitor the category database table for insertions attributed to unusual userid values or values outside the active user set.
Alert on any inbound request to process.php where the Referer, Origin, or session cookie is missing or malformed.

How to Mitigate CVE-2026-87922

Immediate Actions Required

Restrict network access to the application until an authentication check is added, using firewall rules or a reverse-proxy allowlist.
Deploy a Web Application Firewall (WAF) rule that blocks unauthenticated POST requests to includes/process.php targeting the addCategory action.
Audit the category table for unauthorized entries created since deployment and remove any illegitimate records.

Patch Information

No vendor patch has been published. The project uses a rolling release model and, according to the CVE record, the maintainer has not responded to the disclosure filed via GitHub Issue #10 Discussion. Operators should track the GitHub Inventory Management System repository for future commits addressing the missing authentication in DBOperation.addCategory.

Workarounds

Add a server-side session check at the top of includes/process.php that rejects requests without an authenticated session before dispatching to DBOperation.addCategory.
Replace the client-supplied userid parameter with the server-side session user identifier so that identity cannot be spoofed by the caller.
If the application is not required to be internet-facing, place it behind a VPN or internal network segment to reduce exposure.

bash

# Example Apache mod_rewrite rule to block unauthenticated calls to the vulnerable action
# Place in the application vhost or .htaccess
RewriteEngine On
RewriteCond %{REQUEST_URI} includes/process\.php$
RewriteCond %{QUERY_STRING} (^|&)action=addCategory(&|$) [OR]
RewriteCond %{HTTP:Content-Type} application/x-www-form-urlencoded
RewriteCond %{HTTP_COOKIE} !PHPSESSID=[A-Za-z0-9]+
RewriteRule .* - [F,L]