CVE-2026-11506: Leave Management System SQLi Vulnerability

CVE-2026-11506 Overview

CVE-2026-11506 is a SQL injection vulnerability in CodeAstro Leave Management System 1.0. The flaw resides in the /admin/search_staff_for_deletion.php script, where the Name argument is passed to a database query without proper sanitization. Authenticated remote attackers can manipulate the Name parameter to inject arbitrary SQL statements. The issue is classified under [CWE-74] (Improper Neutralization of Special Elements in Output Used by a Downstream Component). A public proof-of-concept has been disclosed, increasing the likelihood of opportunistic exploitation against exposed deployments.

Critical Impact
Authenticated attackers can inject SQL through the admin staff search endpoint, leading to unauthorized read or modification of leave management data.

Affected Products

CodeAstro Leave Management System 1.0
Vulnerable file: /admin/search_staff_for_deletion.php
Vulnerable parameter: Name

Discovery Timeline

2026-06-08 - CVE-2026-11506 published to NVD
2026-06-08 - Last updated in NVD database
2026-06-08 - Public proof-of-concept disclosed via GitHub PoC Issue

Technical Details for CVE-2026-11506

Vulnerability Analysis

The vulnerability exists in the administrative staff deletion search workflow of CodeAstro Leave Management System 1.0. The /admin/search_staff_for_deletion.php endpoint accepts the Name parameter from the requesting client and concatenates the value directly into a backend SQL query. Because the application does not use parameterized queries or sanitize input, attacker-controlled syntax is interpreted as part of the SQL statement.

Successful exploitation allows an attacker to extract employee records, leave balances, and credential material stored in the underlying database. Depending on database privileges, the attacker may also modify or delete records, undermining the integrity of leave tracking. The endpoint requires low-level privileges, meaning a compromised or malicious admin-area session is sufficient to reach the sink.

Additional technical context is published in the VulDB CVE-2026-11506 entry and the VulDB Vulnerability #369126 record.

Root Cause

The root cause is improper neutralization of special elements passed through the Name argument before they are used in a SQL statement. The PHP code constructs the query string with raw input rather than using prepared statements or input validation, allowing meta-characters such as single quotes, comments, and UNION operators to alter query logic.

Attack Vector

The attack is delivered over the network against the admin search endpoint. An attacker with valid low-privilege admin credentials sends a crafted HTTP request containing SQL syntax in the Name parameter. The server-side handler concatenates this value into the query, executes it, and returns results or error output that the attacker can use to enumerate the database schema and exfiltrate data.

The vulnerability is described in prose only; refer to the public GitHub PoC Issue for reproduction details.

Detection Methods for CVE-2026-11506

Indicators of Compromise

HTTP requests to /admin/search_staff_for_deletion.php containing SQL meta-characters such as ', --, UNION SELECT, or OR 1=1 in the Name parameter.
Web server or PHP error logs referencing SQL syntax errors originating from the staff deletion search handler.
Unusually large response sizes from the admin search endpoint, suggesting bulk data extraction.

Detection Strategies

Deploy web application firewall (WAF) signatures that inspect the Name query parameter on the affected path for SQL injection patterns.
Enable database query logging and alert on stacked queries, UNION-based reads, or INFORMATION_SCHEMA access originating from the leave management application user.
Correlate admin session activity with anomalous query volumes against staff or user tables.

Monitoring Recommendations

Monitor authentication logs for unexpected admin logins preceding requests to /admin/search_staff_for_deletion.php.
Track outbound data volumes from the database host to detect bulk exfiltration that may follow successful injection.
Review change history on staff and leave tables for unauthorized inserts, updates, or deletes.

How to Mitigate CVE-2026-11506

Immediate Actions Required

Restrict network access to the /admin/ directory to trusted management IP ranges until a fix is applied.
Rotate all admin credentials and review admin role assignments to limit the attack surface.
Deploy WAF rules blocking SQL meta-characters in the Name parameter on the affected endpoint.

Patch Information

No official vendor patch has been published in the referenced sources at the time of writing. Consult the CodeAstro Security Resource for vendor updates and apply any fixes that introduce parameterized queries to search_staff_for_deletion.php.

Workarounds

Modify /admin/search_staff_for_deletion.php to use prepared statements with bound parameters via PDO or MySQLi.
Apply server-side allowlist validation on the Name field, rejecting characters outside expected alphanumeric and space ranges.
Run the application database account with least-privilege permissions, removing DROP, ALTER, and cross-database access where not required.

bash

# Example PHP fix using PDO prepared statements
$stmt = $pdo->prepare("SELECT id, name FROM staff WHERE name LIKE :name");
$stmt->bindValue(':name', '%' . $_POST['Name'] . '%', PDO::PARAM_STR);
$stmt->execute();
$results = $stmt->fetchAll(PDO::FETCH_ASSOC);