CVE-2026-4235 Overview
CVE-2026-4235 is a SQL injection vulnerability in itsourcecode Online Enrollment System 1.0. The flaw resides in the /sms/login.php endpoint, where the user_email parameter is passed into a database query without proper sanitization. Remote attackers can manipulate this parameter to inject arbitrary SQL statements. The issue is classified under CWE-74 for improper neutralization of special elements in output used by a downstream component. A public exploit is referenced in the vulnerability disclosure, increasing the likelihood of opportunistic attacks against exposed installations.
Critical Impact
Unauthenticated remote attackers can inject SQL through the login form to read, modify, or extract data from the backend database.
Affected Products
- itsourcecode Online Enrollment System 1.0
- Deployments exposing /sms/login.php to untrusted networks
- Installations using the unpatched upstream codebase
Discovery Timeline
- 2026-03-16 - CVE-2026-4235 published to NVD
- 2026-04-29 - Last updated in NVD database
Technical Details for CVE-2026-4235
Vulnerability Analysis
The vulnerability stems from unsanitized input handling in the authentication workflow of the Online Enrollment System. When a user submits credentials, the application concatenates the user_email value directly into a SQL statement. An attacker can craft a request that breaks out of the intended string context and appends arbitrary clauses. Because the endpoint sits before authentication, no valid credentials are required to reach the vulnerable code path. Successful exploitation can disclose stored user data, alter records, or enable authentication bypass through boolean-based or UNION-based payloads.
Root Cause
The root cause is improper neutralization of special characters in the user_email POST parameter processed by /sms/login.php. The application does not use parameterized queries or prepared statements when constructing the login SQL query. User-controlled input flows directly into the query string, which the database engine then interprets as code rather than data. This pattern is a textbook injection flaw mapped to CWE-74.
Attack Vector
The attack is network-based and requires no authentication or user interaction. An attacker sends a crafted HTTP POST request to /sms/login.php with a malicious user_email value. Payloads typically include SQL meta-characters such as single quotes, comment sequences, and UNION SELECT constructs to enumerate database contents. Because the exploit is public, opportunistic scanning against internet-facing deployments is expected.
No verified proof-of-concept code is reproduced here. Technical references describing the injection point are available in the VulDB #351158 Report and the GitHub Issue Discussion.
Detection Methods for CVE-2026-4235
Indicators of Compromise
- HTTP POST requests to /sms/login.php containing SQL meta-characters such as ', --, UNION, SELECT, or OR 1=1 in the user_email field.
- Web server access logs showing repeated login attempts from a single source with abnormally long or malformed user_email values.
- Database error messages returned to clients indicating syntax errors originating from the login flow.
Detection Strategies
- Inspect web application firewall (WAF) telemetry for SQL injection signatures targeting the user_email parameter.
- Correlate authentication failures in /sms/login.php with outbound database query anomalies such as unusually large result sets.
- Apply rule-based identification for known SQLi payload patterns on the enrollment system's request path.
Monitoring Recommendations
- Enable verbose logging on the PHP application and database to capture full request bodies and executed queries for forensic review.
- Alert on response status codes and timing deviations from /sms/login.php that may indicate blind injection probing.
- Monitor for new or unexpected database users, schema reads, or table dumps following suspicious login traffic.
How to Mitigate CVE-2026-4235
Immediate Actions Required
- Restrict access to /sms/login.php by placing the application behind a VPN or IP allowlist until a fix is applied.
- Deploy WAF rules that block SQL injection payloads in the user_email parameter.
- Audit the database for unauthorized reads, modified records, or new privileged accounts created since exposure.
Patch Information
No official vendor patch has been published in the referenced advisories at the time of NVD entry. Operators should track updates through the VulDB #351158 Details page and the upstream project at IT Source Code for remediation guidance.
Workarounds
- Rewrite the login query to use parameterized statements via PDO or MySQLi prepared statements.
- Apply server-side input validation to reject non-email-formatted values in the user_email field.
- Run the database account used by the application with least-privilege permissions to limit injection impact.
# Example: minimal WAF rule (ModSecurity) to block SQLi on user_email
SecRule ARGS:user_email "@detectSQLi" \
"id:1004235,phase:2,deny,status:403,log,\
msg:'Potential SQLi in user_email (CVE-2026-4235)'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
