A critical vulnerability has been identified in Landlord Onboarding software products, assigned a CVSS score of 9.8 out of 10. This flaw allows an unauthenticated remote attacker to gain complete control of affected systems without any user interaction. Successful exploitation could lead to a severe data breach of landlord and tenant information, significant financial loss, and major operational disruption.

This vulnerability is a pre-authentication Remote Code Execution (RCE) flaw within the landlord onboarding workflow and rental signup system. An unauthenticated attacker can send a specially crafted request to an exposed application endpoint, exploiting a flaw in how user-supplied data is processed. This allows the attacker to execute arbitrary commands on the underlying server with the privileges of the web application, leading to a full system compromise.

This vulnerability is rated as critical severity with a CVSS score of 9.8. Exploitation could have a devastating impact on the business, including the complete compromise of sensitive Personally Identifiable Information (PII) and financial data of both landlords and tenants. The consequences include, but are not limited to, significant data breaches leading to regulatory fines, theft of rental payments, widespread service disruption, and severe reputational damage. An attacker gaining full control of the server could use it as a pivot point to attack other internal network resources, escalating the incident's scope and impact.

Immediate Action: Immediately apply the security updates provided by the vendor to upgrade all instances of Landlord Onboarding Multiple Products to the latest version (newer than 2.0.0). Prioritize patching for all internet-facing systems to eliminate the primary attack vector. After patching, review access and system logs for any signs of compromise that may have occurred before the update was applied.

Proactive Monitoring: Enhance monitoring and logging on affected systems to detect potential exploitation attempts. Security teams should look for unusual or malformed requests to the onboarding and signup URLs in web server access logs, unexpected processes being spawned by the web application user, and anomalous outbound network connections from the application servers. Monitor for unauthorized file modifications or the creation of new files in web-accessible directories.

Compensating Controls: If patching cannot be performed immediately, implement the following controls to reduce risk:

• Web Application Firewall (WAF): Deploy a WAF with rules specifically designed to inspect and block malicious payloads targeting the onboarding system, such as command injection or object deserialization patterns.
• Network Segmentation: Isolate the servers running the affected software from critical internal networks to contain a potential breach and prevent lateral movement.
• Restrict Access: If feasible for business operations, temporarily restrict access to the onboarding and signup endpoints to trusted IP address ranges until patching is complete.

Public Exploit Available: False

This vulnerability presents a clear and immediate danger to the organization. Due to the critical CVSS score of 9.8, which indicates that an unauthenticated attacker can achieve full system compromise with low complexity, remediation must be the highest priority. Although CVE-2025-62516 is not currently listed on the CISA KEV list, its severity makes it a prime candidate for future inclusion. We strongly recommend that all affected Landlord Onboarding products be patched immediately. If patching is delayed, the compensating controls outlined above must be implemented without delay while actively monitoring for any signs of an attack.