CVE-2025-67585 identifies an Open Redirect vulnerability in the Flexmls® IDX product by flexmls, affecting all versions up to and including 3.15.7. Open Redirect vulnerabilities occur when a web application accepts a user-controlled input that specifies a URL to which the user is redirected after some action, without proper validation. In this case, the Flexmls® IDX system improperly validates redirect URLs, allowing attackers to craft malicious URLs that redirect users to untrusted external sites. This behavior can be exploited in phishing campaigns, where attackers lure users into clicking on seemingly legitimate links that ultimately lead to malicious websites designed to steal credentials or deliver malware. The vulnerability does not require authentication, meaning any user or attacker can exploit it by sending crafted URLs to victims. No patches or fixes are currently linked, and no known exploits are reported in the wild, but the vulnerability is publicly disclosed and thus could be targeted in the future. Flexmls® IDX is a real estate listing platform widely used by real estate professionals to display property listings and related information. The vulnerability could undermine user trust and lead to credential theft or malware infections if exploited. The absence of a CVSS score requires an assessment based on impact and exploitability factors.

For European organizations, particularly those in the real estate sector using Flexmls® IDX, this vulnerability could lead to increased phishing attacks targeting their clients and employees. Successful exploitation may result in credential theft, unauthorized access to user accounts, and potential downstream compromise of sensitive personal and financial information. This could damage the reputation of real estate agencies and platforms, cause financial losses, and potentially violate data protection regulations such as GDPR if personal data is compromised. The phishing attacks could also be used as a stepping stone for more sophisticated attacks, including malware deployment or business email compromise. The impact is primarily on confidentiality and user trust, with limited direct impact on system integrity or availability. However, widespread phishing could indirectly affect availability if users are locked out or systems are taken offline for remediation.

Organizations should implement strict validation and sanitization of all redirect URLs within Flexmls® IDX to ensure only trusted, internal URLs are allowed. Until an official patch is released, administrators should monitor user activity for suspicious redirects and educate users to be cautious of unexpected links, especially those received via email or messaging platforms. Employing web application firewalls (WAFs) with rules to detect and block open redirect attempts can provide additional protection. Real estate platforms should consider implementing multi-factor authentication (MFA) to reduce the impact of credential theft resulting from phishing. Regular security awareness training focused on phishing recognition is critical. Once patches or updates become available from flexmls, organizations must prioritize their deployment. Additionally, monitoring threat intelligence feeds for emerging exploit attempts related to this CVE is recommended.