CVE-2026-86267: Society Membership System SQL Injection

CVE-2026-86267 Overview

CVE-2026-86267 is a SQL injection vulnerability in itsourcecode Information System Society Membership System 1.0. The flaw resides in the /society/check_student.php script, where the student_id parameter is passed to a database query without proper sanitization. Remote attackers with low privileges can manipulate this parameter to inject arbitrary SQL statements. The exploit has been disclosed publicly, increasing the risk of opportunistic exploitation against exposed installations. The weakness is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component).

Critical Impact
Authenticated remote attackers can inject SQL statements through the student_id parameter of check_student.php, potentially exposing or modifying data stored in the membership database.

Affected Products

itsourcecode Information System Society Membership System 1.0
Component: /society/check_student.php
Vulnerable parameter: student_id

Discovery Timeline

2026-09-07 - CVE-2026-86267 published to NVD
2026-09-08 - Last updated in NVD database

Technical Details for CVE-2026-86267

Vulnerability Analysis

The vulnerability affects the check_student.php endpoint used to validate student identifiers against the membership database. User-supplied input from the student_id parameter is concatenated directly into a SQL query without parameterization or input validation. This allows an authenticated attacker to break out of the query context and append arbitrary SQL clauses.

Because the application appears to be a PHP-based membership system, exploitation typically involves manipulating query results to extract database contents through UNION-based or boolean-based inference techniques. Impact is limited in scope, affecting the confidentiality, integrity, and availability of the local application data only.

Root Cause

The root cause is improper neutralization of special elements passed to the SQL interpreter [CWE-74]. The check_student.php handler does not use prepared statements or apply escaping before including the student_id value in the SQL statement. Any character with SQL meaning, such as a single quote or comment sequence, alters the intended query structure.

Attack Vector

Exploitation requires network access to the web application and a low-privilege authenticated session. An attacker sends a crafted HTTP request containing malicious SQL payloads in the student_id parameter. No user interaction is required beyond submitting the request. Because a public proof of concept exists, opportunistic scanning against exposed instances is likely.

The vulnerability manifests when the student_id parameter is submitted to /society/check_student.php. See the GitHub CVE issue discussion and the VulDB entry for CVE-2026-86267 for technical details.

Detection Methods for CVE-2026-86267

Indicators of Compromise

HTTP requests to /society/check_student.php containing SQL metacharacters such as ', --, UNION, SELECT, or OR 1=1 in the student_id parameter.
Web server access logs showing unusually long or URL-encoded student_id values.
Database error messages returned in HTTP responses referencing SQL syntax issues.
Unexpected SELECT, UNION, or INFORMATION_SCHEMA queries in database audit logs originating from the application service account.

Detection Strategies

Deploy a web application firewall rule that inspects requests to check_student.php and blocks payloads matching SQL injection signatures.
Enable database query logging and alert on queries containing tautologies or references to system tables issued by the membership application.
Correlate authenticated session identifiers with anomalous request patterns targeting the student_id parameter.

Monitoring Recommendations

Monitor outbound data volume from the database host for signs of bulk extraction.
Alert on repeated HTTP 500 responses from /society/ endpoints, which may indicate injection probing.
Review authentication logs for accounts issuing large numbers of requests to check_student.php in short intervals.

How to Mitigate CVE-2026-86267

Immediate Actions Required

Restrict network access to the Information System Society Membership System until a vendor patch is applied.
Audit accounts that can authenticate to the application and revoke unnecessary privileges.
Deploy WAF rules blocking SQL injection payloads targeting the student_id parameter of /society/check_student.php.
Review database and web server logs for prior exploitation attempts.

Patch Information

No vendor patch has been referenced in the available advisories at the time of publication. Consult the IT Source Code project page and the VulDB advisory for updates. Until an official fix is released, administrators should apply compensating controls.

Workarounds

Modify check_student.php to use parameterized queries or prepared statements (for example, PDO with bound parameters) instead of string concatenation.
Apply server-side input validation to reject student_id values that are not numeric or that exceed the expected length.
Restrict the database user account used by the application to the minimum privileges required for membership operations.
Place the application behind an authenticated reverse proxy to limit exposure to trusted networks.

bash

# Example Apache mod_security rule to block SQL metacharacters in student_id
SecRule ARGS:student_id "@rx (?i)(union(\s|/\*.*\*/)+select|--|;|'|\bor\b\s+1=1)" \
    "id:1026086267,phase:2,deny,status:403,\
    msg:'Possible SQL injection targeting CVE-2026-86267',\
    logdata:'Matched student_id: %{MATCHED_VAR}'"