CVE-2026-10251: House Rental System SQLi Vulnerability

CVE-2026-10251 Overview

CVE-2026-10251 is a SQL injection vulnerability in itsourcecode Online House Rental System 1.0. The flaw resides in an unknown function within the /ajax.php?action=login endpoint. Attackers can manipulate the Username argument to inject arbitrary SQL statements. The vulnerability is reachable remotely over the network and requires no authentication or user interaction. Public exploit details have been released, increasing the likelihood of opportunistic abuse against exposed deployments. 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 endpoint, potentially exposing credential data and other contents of the backend database.

Affected Products

itsourcecode Online House Rental System 1.0
Component: /ajax.php?action=login
Vulnerable parameter: Username

Discovery Timeline

2026-06-01 - CVE CVE-2026-10251 published to NVD
2026-06-01 - Last updated in NVD database

Technical Details for CVE-2026-10251

Vulnerability Analysis

The vulnerability is a SQL injection flaw in the login handler of the Online House Rental System. The application passes the Username POST parameter from /ajax.php?action=login into a backend SQL query without proper sanitization or parameterization. An attacker submits crafted SQL syntax through the Username field, and the database engine executes the injected logic alongside the intended authentication query.

Because the entry point is the login form, exploitation does not require valid credentials or any prior session. The attack vector is network-based with low complexity, and no user interaction is needed. Public proof-of-concept material is referenced in VulDB CVE-2026-10251 and an associated GitHub Issue Discussion.

Root Cause

The root cause is improper neutralization of special elements ([CWE-74]) in input data used to construct the authentication SQL query. The login routine concatenates the supplied Username value directly into the query rather than using prepared statements with bound parameters. Any quoting, comment sequences, or UNION clauses placed in the parameter alter the structure of the executed query.

Attack Vector

The attacker sends an HTTP POST request to /ajax.php?action=login with a SQL payload in the Username field and any value for the password field. Typical payloads use boolean-based, UNION-based, or time-based techniques to enumerate the schema and extract data such as the users table containing administrator credentials. Successful injection can lead to authentication bypass, credential disclosure, and full read access to the application database.

No verified exploit code is reproduced here. Refer to the VulDB Vulnerability #367529 record for technical details.

Detection Methods for CVE-2026-10251

Indicators of Compromise

POST requests to /ajax.php?action=login containing SQL metacharacters such as ', ", --, #, UNION, SLEEP(, or OR 1=1 in the Username field.
Web server access logs showing repeated login attempts with unusually long Username values or encoded payloads (%27, %20OR%20).
Database error messages returned in HTTP responses referencing MySQL syntax errors triggered by malformed injection attempts.
Anomalous outbound DNS or HTTP callbacks from the database host indicating out-of-band exfiltration.

Detection Strategies

Deploy a web application firewall (WAF) rule that inspects the Username POST parameter on /ajax.php?action=login for SQL syntax tokens.
Enable database query logging and alert on queries against the users or authentication tables that contain tautologies or UNION SELECT clauses.
Correlate failed login bursts from a single source IP with response-time spikes characteristic of time-based blind injection.

Monitoring Recommendations

Forward web server and PHP error logs to a centralized log platform and build identifications for SQL error strings tied to the rental application path.
Monitor for new administrator accounts, password hash changes, or unexpected data reads from rental and tenant tables.
Track HTTP 500 responses on /ajax.php over time, as injection probing often produces server errors before a working payload is found.

How to Mitigate CVE-2026-10251

Immediate Actions Required

Restrict network access to the Online House Rental System 1.0 application until a vendor fix is verified, placing it behind VPN or IP allowlists.
Deploy WAF signatures blocking SQL injection patterns targeting the Username parameter on /ajax.php?action=login.
Rotate all application and database credentials and review the users table for unauthorized accounts.
Audit web and database logs for prior exploitation indicators dating back to the application's deployment.

Patch Information

No official vendor patch is referenced in the advisory data for CVE-2026-10251. Operators should monitor itsourcecode.com for updates and consult VulDB Submission #824090 for further details. Until a fix is published, code-level remediation requires replacing string-concatenated SQL in the login handler with parameterized queries (prepared statements) using PDO or mysqli bound parameters.

Workarounds

Implement server-side input validation that rejects non-alphanumeric characters in the Username field before it reaches the database layer.
Apply a virtual patch at the reverse proxy or WAF to drop requests to /ajax.php?action=login containing SQL keywords or quote characters.
Enforce least-privilege on the MySQL account used by the application so it cannot read sensitive tables or execute administrative statements.
Disable or remove the application from internet-facing infrastructure if it is not actively required.

bash

# Example ModSecurity rule to block SQLi patterns on the login endpoint
SecRule REQUEST_URI "@beginsWith /ajax.php" \
  "chain,phase:2,deny,status:403,id:1026102510,msg:'Block SQLi on Online House Rental login'"
  SecRule ARGS:Username "@rx (?i)(\\b(union|select|sleep|or|and)\\b.*\\b(from|=|--|#)|['\"])" "t:none,t:urlDecodeUni"