CVE-2026-9451: Employee Management System SQLi Vulnerability

CVE-2026-9451 Overview

CVE-2026-9451 is a SQL injection vulnerability in code-projects Employee Management System 1.0. The flaw resides in the /process/applyleaveprocess.php script, where the ID parameter is passed to a database query without proper sanitization. An authenticated remote attacker can manipulate this parameter to inject arbitrary SQL syntax into the underlying query.

The vulnerability is classified under CWE-74 (Improper Neutralization of Special Elements in Output). A public exploit description has been published, lowering the barrier to attack reproduction.

Critical Impact
Remote attackers with low-level privileges can read, modify, or destroy data in the application database by injecting SQL through the ID argument in applyleaveprocess.php.

Affected Products

code-projects Employee Management System 1.0
/process/applyleaveprocess.php endpoint
Deployments exposing the leave application workflow to authenticated users

Discovery Timeline

2026-05-25 - CVE-2026-9451 published to NVD
2026-05-26 - Last updated in NVD database

Technical Details for CVE-2026-9451

Vulnerability Analysis

The vulnerability exists in the leave application processing logic of Employee Management System 1.0. The applyleaveprocess.php script accepts an ID parameter from the HTTP request and concatenates it directly into a SQL statement. Because no parameterized query or input validation is applied, attacker-controlled SQL fragments alter the query structure.

An attacker authenticated as a low-privilege user can submit payloads that extract data from arbitrary tables, bypass logical checks, or perform UNION-based and boolean-based extraction. The EPSS score of 0.028% reflects limited current exploitation activity, but public exploit availability increases the likelihood of opportunistic attacks against exposed instances.

Root Cause

The root cause is improper neutralization of special elements in user-supplied input passed to the SQL interpreter. The ID argument flows from request input into a query string without prepared statements or escaping. This pattern is consistent with CWE-74 injection weaknesses where downstream interpreters parse attacker-controlled data.

Attack Vector

Exploitation requires network access to the application and a low-privilege authenticated session. The attacker sends a crafted HTTP request to /process/applyleaveprocess.php with a malicious ID value. No user interaction is required. Refer to the GitHub CVE-1 Vulnerability Documentation and VulDB Vulnerability #365432 for the documented exploitation steps.

Detection Methods for CVE-2026-9451

Indicators of Compromise

HTTP requests to /process/applyleaveprocess.php containing SQL metacharacters such as single quotes, UNION SELECT, --, OR 1=1, or SLEEP( in the ID parameter.
Database error messages in application logs referencing syntax errors triggered by the ID argument.
Anomalous database query volume or response times correlated with leave application requests.

Detection Strategies

Inspect web server access logs for unusual ID parameter values targeting applyleaveprocess.php.
Deploy web application firewall (WAF) rules that flag SQL injection signatures on the leave processing endpoint.
Enable database query logging and alert on queries containing UNION operations or stacked statements originating from the application user.

Monitoring Recommendations

Correlate authentication events with subsequent requests to applyleaveprocess.php to detect post-login probing.
Monitor for repeated 500-series HTTP responses from the leave processing path that indicate failed injection attempts.
Track outbound database connections for unexpected data volumes consistent with bulk extraction.

How to Mitigate CVE-2026-9451

Immediate Actions Required

Restrict access to /process/applyleaveprocess.php to trusted networks until a patched build is deployed.
Audit recent database activity from the application account for unauthorized SELECT, UPDATE, or DELETE operations.
Rotate database credentials used by the Employee Management System if compromise is suspected.

Patch Information

No official vendor patch has been published in the NVD record at the time of writing. Consult the Code Projects Resource Hub for vendor updates and the VulDB Vulnerability #365432 entry for remediation guidance.

Workarounds

Modify applyleaveprocess.php to use prepared statements with parameter binding for the ID argument.
Apply server-side input validation that enforces a numeric type and length constraint on ID.
Deploy a WAF rule blocking SQL metacharacters in requests to the leave processing endpoint.
Run the application database account with least-privilege permissions to limit the impact of successful injection.

bash

# Example WAF rule (ModSecurity) blocking SQLi patterns on the affected endpoint
SecRule REQUEST_URI "@contains /process/applyleaveprocess.php" \
  "phase:2,chain,deny,status:403,id:1009451,msg:'Possible SQLi on applyleaveprocess.php'"
    SecRule ARGS:ID "@rx (?i)(union(\s+all)?\s+select|or\s+1=1|--|;|sleep\(|benchmark\()" "t:none,t:urlDecodeUni"