CVE-2026-12776: SQL Injection in Montodel House-Rental-Management

Technical summary

The vulnerability exists in the /index.php?page=houses endpoint where user-supplied input in the ID parameter is not adequately sanitized before being incorporated into SQL queries. This allows SQL injection attacks (CWE-89) via improper input validation (CWE-74). The flaw affects Montodel House-Rental-Management up to commit 90010017b81265eb1ef3810268909f7719a33863. Because the product uses a rolling release model without semantic versioning, specific patched versions cannot be identified from vendor advisories. Exploitation requires prior authentication, limiting but not eliminating risk in multi-tenant or internally-exposed deployments.

Business impact

SQL injection in a rental management system directly threatens confidentiality and integrity of property listings, tenant information, payment records, and booking data. Attackers could extract competitive intelligence, modify pricing or availability, corrupt booking records, or facilitate fraud. For managed service providers or platforms hosting multiple rental businesses, this creates cascading liability and reputational damage. Data exfiltration may trigger regulatory notifications under GDPR, CCPA, or sector-specific privacy laws.

Affected systems

Montodel House-Rental-Management installations are affected up to the commit hash 90010017b81265eb1ef3810268909f7719a33863. The vendor operates on a rolling release model, meaning there are no traditional version numbers. Organizations using this software should immediately verify their current commit hash against the advisory and determine if patches have been released through their normal update channel. Small-to-medium property management firms, boutique rental platforms, and hospitality operators using this system are most exposed.

Exploitability

This vulnerability has a CVSS 3.1 score of 6.3 (MEDIUM) with a network-accessible attack vector, low complexity, and requirement for valid user credentials. Public exploit code is confirmed available, substantially lowering the barrier to weaponization. Internal attackers, compromised employee accounts, or attackers who gain initial access through phishing or credential stuffing can immediately exploit this to pivot into backend databases. The low attack complexity means exploitation does not require special tools or conditions beyond crafting malicious SQL payloads.

Remediation

Immediate action required: (1) Identify your exact deployment commit hash and cross-reference it against Montodel's latest release; (2) Apply the most recent rolling release patch available from the vendor; (3) If the vendor has not released a patch, implement a Web Application Firewall (WAF) rule to block SQL injection patterns in the ID parameter of /index.php?page=houses endpoints; (4) Restrict database user privileges to read-only where feasible, and implement parameterized queries or prepared statements in the application code if source access is available; (5) Monitor database logs for suspicious SQL activity.

Patch guidance

Because Montodel uses continuous rolling releases without versioned releases, you must check the vendor's repository or release notes directly to determine if a patch exists for your deployment. Compare your current commit hash against the latest commit in the stable or production branch. If no patch has been released as of the vulnerability disclosure date (2026-06-22), contact your vendor or evaluate temporary mitigations (WAF rules, access controls). Once a patch is available, test it in a staging environment before production deployment to ensure compatibility with your rental data and integrations.

Detection guidance

Search your web server and application logs for SQL syntax in the ID parameter of requests to /index.php?page=houses, particularly patterns like UNION, SELECT, OR, xp_, sp_, cmd, or comments (-- , /* */). Monitor database query logs for unexpected UNION queries, subqueries, or time-delay functions (SLEEP, BENCHMARK) that may indicate reconnaissance. Network intrusion detection systems should flag SQL injection signatures against this endpoint. Additionally, monitor user account activity for privilege escalation or unusual data access patterns post-authentication.

Why prioritize this

Although this vulnerability carries a MEDIUM CVSS score, its combination of public exploit availability, authenticated-user attack surface, and direct database access in a data-sensitive application (rental/property management) warrants prompt remediation. The vendor's non-responsiveness suggests patches may be delayed, necessitating interim defensive measures. Organizations should prioritize this based on whether their Montodel instance is internet-facing, whether users beyond trusted administrators can authenticate, and the sensitivity of property and tenant data stored in the backend database.

Risk score, explained

The CVSS 3.1 score of 6.3 reflects: network-accessible attack vector (AV:N), low attack complexity (AC:L), requirement for low-privilege authentication (PR:L), no user interaction needed (UI:N), single scope of impact (S:U), and limited confidentiality, integrity, and availability impact (C:L/I:L/A:L). The score is elevated from the floor by the authenticated requirement but remains in the MEDIUM band due to network accessibility and direct database impact. The availability of public exploit code and vendor non-response increase real-world risk beyond the baseline score.

Frequently asked questions