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 application redirects the user, without proper validation. In this case, attackers can craft malicious URLs that appear to originate from a trusted Flexmls® IDX domain but redirect victims to untrusted external sites. This behavior can be exploited in phishing campaigns, where attackers lure users into clicking these URLs, leading them to fraudulent websites designed to steal credentials or deliver malware. The vulnerability does not require authentication, making it accessible to any attacker, but it does require user interaction (clicking the malicious link). The CVSS 3.1 base score is 4.7, indicating a medium severity level, with the vector AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N. This means the attack is network-based, requires low attack complexity, no privileges, user interaction is required, and the scope is changed (the impact extends beyond the vulnerable component). The confidentiality impact is low, as the main risk is phishing rather than direct data compromise. There are no known exploits in the wild, and no patches or fixes have been published at the time of this report. The vulnerability primarily impacts the confidentiality of users who fall victim to phishing, as it can lead to credential theft or other social engineering outcomes. The integrity and availability of the Flexmls® IDX system itself are not directly affected. The vulnerability is relevant to organizations using Flexmls® IDX, particularly those in real estate sectors that rely on this platform for property listings and client interactions.

For European organizations, the primary impact of CVE-2025-67585 is an increased risk of successful phishing attacks leveraging trusted Flexmls® IDX URLs. This can lead to credential compromise, unauthorized access to sensitive client data, and potential financial fraud. Real estate agencies and property platforms using Flexmls® IDX may see reputational damage if their domains are used in phishing campaigns. Although the vulnerability does not directly compromise system integrity or availability, the indirect consequences of phishing can be severe, including data breaches and regulatory penalties under GDPR if personal data is exposed. The medium CVSS score reflects that while the vulnerability is not critical, it poses a meaningful threat that can be exploited easily without authentication. European organizations must consider the risk of user-targeted attacks and the potential for attackers to exploit this vulnerability as part of broader social engineering campaigns. The lack of known exploits in the wild suggests the threat is currently low but could increase once exploit code becomes available.

To mitigate CVE-2025-67585, organizations should implement strict validation and sanitization of all URL parameters used for redirection within Flexmls® IDX. This includes enforcing allowlists of trusted domains and rejecting or neutralizing any redirect URLs that point to untrusted external sites. If possible, update to a patched version of Flexmls® IDX once available. In the absence of patches, consider deploying web application firewalls (WAFs) with rules to detect and block suspicious redirect patterns. Educate users and employees about the risks of phishing and encourage vigilance when clicking on links, especially those received via email or messaging platforms. Monitor logs for unusual redirect activity and investigate any reports of phishing attempts involving Flexmls® IDX URLs. Additionally, implement multi-factor authentication (MFA) for user accounts to reduce the impact of credential compromise. Regularly review and audit web application configurations to ensure no other redirect vulnerabilities exist. Coordinate with the vendor for timely updates and advisories.