CVE-2026-12776: House-Rental-Management SQL Injection Flaw

CVE-2026-12776 Overview

CVE-2026-12776 is a SQL injection vulnerability in Montodel House-Rental-Management up to commit 90010017b81265eb1ef3810268909f7719a33863. The flaw resides in the /index.php?page=houses endpoint, where the ID argument is passed unsanitized to a backend database query. An authenticated remote attacker with low privileges can manipulate the parameter to alter SQL statement logic. The exploit has been publicly disclosed and may be used by opportunistic attackers. The vendor was contacted prior to disclosure but did not respond. Because the product follows a rolling release model, no fixed version identifier exists.

Critical Impact
Remote attackers with low-privileged accounts can inject arbitrary SQL through the ID parameter on the houses page, exposing or modifying tenant, property, and account data.

Affected Products

Montodel House-Rental-Management (rolling release)
Commits up to 90010017b81265eb1ef3810268909f7719a33863
Component: /index.php?page=houses (ID parameter)

Discovery Timeline

2026-06-21 - CVE-2026-12776 published to NVD
2026-06-22 - Last updated in NVD database

Technical Details for CVE-2026-12776

Vulnerability Analysis

The vulnerability is a SQL injection flaw classified under [CWE-74] (Improper Neutralization of Special Elements in Output Used by a Downstream Component). The affected code path is reached through GET /index.php?page=houses with a manipulated ID query parameter. User-supplied input is concatenated directly into a SQL statement without parameterization or input validation. An attacker can append boolean conditions, UNION SELECT payloads, or stacked queries to read or modify backend records.

The attack is exploitable over the network and requires only low-privileged authentication. No user interaction is needed. The EPSS probability is 0.192% as of 2026-06-25, indicating limited but non-zero predicted exploitation activity. Public proof-of-concept material is referenced through VulDB entry 372518 and GitHub Issue #68.

Root Cause

The root cause is the direct concatenation of the ID request parameter into a SQL query string. The application does not apply prepared statements, parameter binding, or type casting to integer identifiers. Any string the attacker submits in ID becomes part of the executed SQL syntax.

Attack Vector

An authenticated user issues a crafted HTTP GET request to /index.php?page=houses&ID=<payload>. The injected payload is parsed by the database server, allowing data extraction, authentication bypass via UNION-based queries, or modification of records. Because exploitation is remote and scriptable, automated tools such as sqlmap can enumerate the vulnerability and exfiltrate data.

No verified exploit code is included here. Refer to the GitHub disclosure issue and VulDB CVE-2026-12776 entry for technical proof-of-concept details.

Detection Methods for CVE-2026-12776

Indicators of Compromise

HTTP requests to /index.php?page=houses containing SQL metacharacters in the ID parameter, such as single quotes, UNION, SELECT, --, or OR 1=1.
Database error responses returned to the client following malformed ID values.
Spikes in query latency or row counts from the houses table tied to authenticated low-privileged sessions.

Detection Strategies

Deploy WAF signatures that flag SQL injection patterns in query string parameters, with rules tuned to the page=houses endpoint.
Enable database query logging and alert on dynamically constructed queries against the houses table that contain unexpected operators.
Correlate authenticated session activity with anomalous response sizes that indicate UNION-based data exfiltration.

Monitoring Recommendations

Monitor web server access logs for repeated requests to /index.php?page=houses with encoded payloads (%27, %20OR%20).
Track failed-then-successful login sequences followed by SQLi probing on the houses endpoint.
Review database audit logs for INFORMATION_SCHEMA access originating from the application service account.

How to Mitigate CVE-2026-12776

Immediate Actions Required

Restrict access to /index.php?page=houses to trusted networks or place the application behind an authenticated reverse proxy until code is remediated.
Deploy a WAF rule that blocks SQL metacharacters and reserved keywords in the ID parameter.
Audit the database for unauthorized read or write activity originating from low-privileged accounts.

Patch Information

No vendor patch is available. The vendor did not respond to the disclosure, and the rolling release model provides no version tag for a fix. Operators should apply source-level fixes by converting the affected query to a parameterized prepared statement and validating that ID is a positive integer before query execution.

Workarounds

Modify the application source to use prepared statements with bound parameters for all database access on the houses page.
Enforce server-side input validation that casts ID to an integer and rejects non-numeric values before reaching the query layer.
Apply least-privilege database accounts so the web application user cannot read sensitive tables or execute administrative statements.

bash

# Example ModSecurity rule to block SQLi attempts against the houses endpoint
SecRule REQUEST_URI "@beginsWith /index.php" \
  "chain,id:1012776,phase:2,deny,status:403,msg:'CVE-2026-12776 SQLi attempt'"
  SecRule ARGS:page "@streq houses" \
    "chain"
    SecRule ARGS:ID "@rx (?i)(union|select|--|';|or\s+1=1)" \
      "t:none,t:urlDecodeUni"