CVE-2026-10237: Water Billing System SQLi Vulnerability

CVE-2026-10237 Overview

CVE-2026-10237 is an authenticated SQL injection vulnerability in SourceCodester Water Billing Management System 1.0. The flaw resides in the User Management Module, specifically in the /admin/?page=user/manage_user endpoint. Attackers manipulate the ID parameter to inject arbitrary SQL into backend database queries. The issue is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component). Public exploit details have been disclosed, lowering the barrier for opportunistic abuse. Exploitation requires high-privilege authentication, which constrains the practical impact but still exposes administrative database content to manipulation.

Critical Impact
Authenticated attackers with administrative access can inject SQL through the ID parameter of the user management page, enabling unauthorized read or modification of backend database contents.

Affected Products

SourceCodester Water Billing Management System 1.0
User Management Module (/admin/?page=user/manage_user)
Backend MySQL/MariaDB database used by the application

Discovery Timeline

2026-06-01 - CVE-2026-10237 published to NVD
2026-06-01 - Last updated in NVD database

Technical Details for CVE-2026-10237

Vulnerability Analysis

The Water Billing Management System exposes an administrative user management page at /admin/?page=user/manage_user. The application accepts a user-supplied ID parameter and concatenates it directly into a SQL statement without parameterized queries or input sanitization. An authenticated administrator can submit crafted values that break the intended query structure and append attacker-controlled SQL.

Because the vulnerable endpoint sits behind administrative authentication, the attack vector is network-based but requires valid high-privilege credentials. The EPSS probability stands at 0.032%, reflecting limited expected exploitation activity in the wild. Public proof-of-concept material is referenced in third-party research repositories, which raises the likelihood of opportunistic copy-paste abuse against exposed installations.

Root Cause

The root cause is improper neutralization of input used in a SQL query [CWE-74]. The manage_user handler builds its SQL string through direct concatenation of the ID GET parameter. No prepared statements, type casting, or allow-list validation is applied before the value reaches the database driver.

Attack Vector

An authenticated administrator sends an HTTP request to /admin/?page=user/manage_user with a tampered ID query parameter containing SQL metacharacters such as single quotes, UNION SELECT clauses, or boolean payloads. The injected statement executes within the database context used by the application, exposing user records, password hashes, and billing data.

No verified exploit code is published in trusted advisories. Technical write-ups describing the injection pattern are available in the referenced GitHub Security Research Document and the VulDB CVE-2026-10237 entry.

Detection Methods for CVE-2026-10237

Indicators of Compromise

HTTP requests to /admin/?page=user/manage_user containing SQL metacharacters such as ', --, UNION, SLEEP(, or OR 1=1 in the ID parameter.
Database error messages or HTTP 500 responses generated from the manage_user page during normal administrative browsing.
Unexpected SELECT, UPDATE, or INFORMATION_SCHEMA queries in MySQL/MariaDB logs originating from the Water Billing Management System database user.
Anomalous administrative session activity producing large response sizes from the user management endpoint.

Detection Strategies

Deploy web application firewall rules that inspect the ID query parameter for SQL syntax and reject non-numeric values.
Enable verbose database query logging and alert on queries that reference manage_user with concatenated tautologies or UNION operators.
Correlate administrative authentication events with subsequent injection-like request patterns to identify compromised or abusive admin accounts.

Monitoring Recommendations

Monitor outbound data volumes from the database server for spikes consistent with bulk record extraction.
Track failed login attempts and credential reuse against the /admin/ interface to identify pre-exploitation reconnaissance.
Review web server access logs daily for requests with encoded SQL payloads (%27, %20UNION%20, %2D%2D) targeting manage_user.

How to Mitigate CVE-2026-10237

Immediate Actions Required

Restrict access to the /admin/ interface using IP allow-listing or VPN-only routing until the application is patched.
Rotate all administrative credentials and audit the user table for unauthorized accounts created via injection.
Place a web application firewall in front of the application with strict input validation on the ID parameter.
Take internet-facing instances offline if administrative access cannot be constrained to trusted networks.

Patch Information

No official vendor patch has been published in the referenced advisories at the time of NVD publication. SourceCodester typically distributes updates through its project portal. Operators should monitor the vendor site and the VulDB Vulnerability #367516 entry for remediation updates. Until a fix is available, code owners can apply a local patch that replaces the vulnerable concatenated SQL with a prepared statement and casts the ID value to an integer before query construction.

Workarounds

Modify the manage_user handler to use parameterized queries via PDO or mysqli prepared statements.
Cast the ID parameter to an integer with intval() before any database interaction and reject non-numeric input.
Apply least-privilege to the database account used by the application, removing INFORMATION_SCHEMA and write privileges where not required.
Disable the User Management Module if it is not actively used in the deployment.

bash

# Example WAF rule (ModSecurity) blocking SQLi against manage_user
SecRule REQUEST_URI "@contains /admin/?page=user/manage_user" \
  "chain,phase:2,deny,status:403,id:1026102370,msg:'CVE-2026-10237 SQLi attempt'"
  SecRule ARGS:id "!@rx ^[0-9]+$" "t:none,t:urlDecodeUni"