CVE-2026-18958: Student Management System SQLi Vuln

CVE-2026-18958 Overview

CVE-2026-18958 is a SQL injection vulnerability in the imranrisal-dev Student-Management-System project. The flaw resides in loginCheckTest.php, part of the Login component. Attackers can manipulate the username and password parameters to inject arbitrary SQL statements. The attack is exploitable remotely without authentication or user interaction. A public exploit is available, increasing the risk of opportunistic abuse. The project does not use versioning, so no specific fixed or vulnerable releases are identified. According to the advisory, the vendor was contacted but did not respond. The weakness is classified under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component.

Critical Impact
Unauthenticated remote attackers can inject SQL through the login form, potentially reading, modifying, or destroying database records. A public exploit is already available.

Affected Products

imranrisal-dev Student-Management-System (commit 18ea7904c339e0c7b0234724a79c939ce6191def)
imranrisal-dev Student-Management-System (commit a8d43a29aaf267e7ca97171d6dbb44057bcd7f8c)
Deployments serving loginCheckTest.php from the Login component

Discovery Timeline

2026-08-05 - CVE CVE-2026-18958 published to NVD
2026-08-05 - Last updated in NVD database

Technical Details for CVE-2026-18958

Vulnerability Analysis

The vulnerability exists in loginCheckTest.php, which handles login authentication. The script accepts username and password values from the client and concatenates them directly into a SQL query. Because the inputs are not parameterized or sanitized, an attacker can break out of the intended query context. Injected SQL executes with the privileges of the database user configured for the application. Successful exploitation can bypass authentication, extract stored credentials, or manipulate application data. Because the endpoint is reachable over the network and requires no privileges or user interaction, exploitation is straightforward. The public availability of a working proof of concept lowers the skill required for an attacker to weaponize this issue.

Root Cause

The root cause is improper neutralization of user-supplied input passed to a downstream SQL interpreter [CWE-74]. The loginCheckTest.php handler builds SQL statements using string concatenation from the username and password request parameters. No prepared statements, parameter binding, or input validation are applied before query execution.

Attack Vector

An unauthenticated remote attacker sends a crafted HTTP request to loginCheckTest.php with SQL metacharacters in the username or password field. The injected payload alters the intended query, allowing authentication bypass or extraction of arbitrary rows from the backing database. The GitHub issue referenced in the advisory documents the exploitation approach. Details are available in the GitHub Issue Report and the VulDB CVE Documentation.

No verified proof-of-concept code is republished here. Refer to the linked advisories for the exact payload structure.

Detection Methods for CVE-2026-18958

Indicators of Compromise

HTTP POST requests to loginCheckTest.php containing SQL metacharacters such as ', --, #, OR 1=1, or UNION SELECT in the username or password parameters.
Web server access logs showing repeated failed or anomalous login attempts from a single source targeting the login endpoint.
Database error messages returned to clients that reference SQL syntax errors originating from the login handler.
Unexpected database queries containing tautologies or UNION-based clauses tied to the login workflow.

Detection Strategies

Deploy web application firewall (WAF) rules to identify SQL injection signatures targeting the /loginCheckTest.php path.
Enable database query logging and alert on queries that deviate from the expected parameterized login pattern.
Correlate authentication attempts with subsequent privileged database operations to identify authentication bypass.
Baseline normal login traffic patterns and alert on spikes of malformed requests to the login endpoint.

Monitoring Recommendations

Forward web server, application, and database logs to a centralized SIEM for cross-source correlation.
Monitor for outbound data transfers immediately following anomalous login requests, indicating possible data exfiltration.
Track new administrator or high-privilege account creations that follow suspicious login activity.
Review authentication logs for successful logins that lack corresponding valid credential events.

How to Mitigate CVE-2026-18958

Immediate Actions Required

Restrict network exposure of the Student-Management-System login endpoint to trusted networks or take the application offline until remediated.
Rotate all database credentials and any user credentials stored by the application.
Review database audit logs for evidence of unauthorized queries against the login flow.
Deploy WAF rules blocking SQL injection payloads on the loginCheckTest.php endpoint as a compensating control.

Patch Information

No official patch is available. The advisory notes that the vendor was contacted but did not respond, and the project does not use versioning. Users must apply source-level fixes themselves: replace concatenated SQL in loginCheckTest.php with prepared statements using parameter binding (for example, PDO or MySQLi with bound parameters), and validate input lengths and character sets before use. Track updates via the VulDB Vulnerability Details page.

Workarounds

Place the application behind a WAF with SQL injection protections enabled and tuned for the login endpoint.
Restrict the database user account used by the application to the minimum privileges required, eliminating DDL and cross-database rights.
Disable or remove loginCheckTest.php if it is a test artifact not required in production deployments.
Enforce network-level access controls that limit reachability of the application to authenticated VPN users.

bash

# Example WAF ModSecurity rule blocking common SQLi patterns on the login endpoint
SecRule REQUEST_URI "@endsWith /loginCheckTest.php" \
  "phase:2,chain,deny,status:403,id:1009581,\
   msg:'Potential SQL Injection in Student-Management-System login'"
  SecRule ARGS:username|ARGS:password \
    "@rx (?i)(\bunion\b.*\bselect\b|--|\bor\b\s+1=1|;|/\*)"