CVE-2026-87921: Inventory Management System SQLI Vulnerability

CVE-2026-87921 Overview

CVE-2026-87921 is a SQL injection vulnerability in the Rizwan17 inventory-management-system project up to commit bfe78a330d01bb26b9daec5dc9ecd5c77900e03f. The flaw resides in the update_record function of includes/manage.php. Attackers can manipulate the update_category, cid, update_brand, and update_product parameters to inject arbitrary SQL statements. The attack is exploitable remotely without authentication, and a public exploit is available. The project uses a rolling release model, so specific patched versions are not defined. The maintainer was notified through an issue report but has not responded, leaving deployments exposed.

Critical Impact
Unauthenticated remote attackers can execute arbitrary SQL queries against the backend database, exposing inventory, customer, and credential data.

Affected Products

Rizwan17 inventory-management-system (rolling release)
Commits up to and including bfe78a330d01bb26b9daec5dc9ecd5c77900e03f
includes/manage.php component using the update_record function

Discovery Timeline

2026-09-09 - CVE-2026-87921 published to NVD
2026-09-09 - Last updated in NVD database

Technical Details for CVE-2026-87921

Vulnerability Analysis

The vulnerability is a classic SQL injection flaw [CWE-74] in the update_record function within includes/manage.php. The function accepts client-supplied input from the update_category, cid, update_brand, and update_product parameters and concatenates those values directly into SQL statements. Because the input is not parameterized or escaped, attackers can break out of the intended query context and append arbitrary SQL clauses. Exploitation requires no authentication, no user interaction, and can be performed remotely over HTTP. Successful injection permits data disclosure, tampering with inventory records, or destructive operations such as dropping tables. Refer to the VulDB entry for CVE-2026-87921 for additional technical context.

Root Cause

The root cause is the absence of prepared statements or input sanitization inside update_record. User-controlled request parameters are interpolated directly into SQL update statements executed against the backend database. The project also lacks a security review process for its rolling-release model, which delays remediation.

Attack Vector

An attacker sends a crafted HTTP request to the endpoint that invokes update_record, embedding SQL metacharacters and injected payloads within the vulnerable parameters. Because the request is processed server-side without validation, the injected payload is executed by the database. Public exploit details are referenced in the GitHub issue tracker for the project.

// No verified proof-of-concept code is republished here.
// See the referenced GitHub issue and VulDB entry for technical details.

Detection Methods for CVE-2026-87921

Indicators of Compromise

HTTP requests to includes/manage.php containing SQL metacharacters such as single quotes, UNION SELECT, --, or ; in the update_category, cid, update_brand, or update_product parameters.
Database error messages or unexpected 500 responses correlating with requests targeting the update_record handler.
Anomalous outbound database queries returning large record sets or accessing tables outside the inventory schema.

Detection Strategies

Deploy web application firewall (WAF) rules that inspect POST and GET parameters for SQL injection payload signatures targeting manage.php.
Enable database query logging and alert on queries containing tautologies (OR 1=1), INFORMATION_SCHEMA access, or stacked statements originating from the inventory application.
Correlate authentication-less requests to update endpoints with subsequent unusual data reads for early identification.

Monitoring Recommendations

Ingest web server access logs and database audit logs into a centralized analytics platform for correlation.
Monitor for spikes in request volume to includes/manage.php and repeated 4xx/5xx responses from the same source IP.
Track modifications to inventory, brand, and category tables outside of normal business workflows.

How to Mitigate CVE-2026-87921

Immediate Actions Required

Restrict network access to the application, placing it behind authenticated VPN or IP allowlists until a fix is available.
Deploy WAF signatures blocking SQL injection payloads directed at the update_record endpoint and its parameters.
Audit the database for unauthorized modifications and rotate credentials that may have been exposed.

Patch Information

No official patch has been released. The maintainer was informed via GitHub issue #9 but has not responded. Organizations running this project should fork the code and apply parameterized queries to the update_record function, or migrate to a supported inventory application. Track updates through the project repository.

Workarounds

Rewrite the update_record function to use prepared statements with bound parameters via PDO or MySQLi.
Apply server-side input validation that rejects non-numeric values for identifier parameters such as cid.
Enforce least-privilege database accounts so the application user cannot execute DDL or read sensitive tables.

bash

# Example WAF rule (ModSecurity) blocking SQLi patterns on the vulnerable endpoint
SecRule REQUEST_URI "@contains /includes/manage.php" \
    "phase:2,deny,status:403,id:1029871,\
    chain,msg:'Potential SQLi against update_record (CVE-2026-87921)'"
    SecRule ARGS:update_category|ARGS:cid|ARGS:update_brand|ARGS:update_product \
        "@rx (?i)(union(\s|/\*.*\*/)+select|--|;|'|\bor\b\s+1=1)"