CVE-2025-67502 is classified as a CWE-601 (Open Redirect) vulnerability affecting the open source qualitative research tool Taguette, specifically versions 1.5.1 and earlier. The flaw arises because the application accepts a user-supplied 'next' parameter that controls the destination URL after authentication, but fails to validate or sanitize this parameter. As a result, attackers can craft URLs that appear to lead to legitimate Taguette pages but redirect users to arbitrary external websites once they authenticate. This behavior can be exploited in phishing campaigns where victims are tricked into trusting the initial URL, only to be redirected to malicious sites designed to steal credentials or deliver malware payloads. The vulnerability does not require any privileges or authentication to initiate but does require user interaction (clicking a crafted link). The CVSS 3.1 base score is 5.4, reflecting medium severity due to the limited impact on confidentiality and integrity, no impact on availability, and the need for user interaction. The issue was publicly disclosed on December 9, 2025, and resolved in Taguette version 1.5.2. No known exploits in the wild have been reported to date. The vulnerability highlights the importance of validating redirect URLs to prevent abuse in web applications, especially those handling sensitive research data.

For European organizations using Taguette for qualitative research, this vulnerability poses a moderate risk primarily through social engineering and phishing attacks. Attackers can exploit the open redirect to deceive users into visiting malicious websites that may harvest credentials or deploy malware, potentially compromising user accounts and sensitive research data. While the vulnerability itself does not directly allow data breach or system compromise, the phishing vector can lead to broader security incidents. Organizations in sectors such as academia, market research, and social sciences that rely on Taguette may face reputational damage and operational disruption if users fall victim. The impact is heightened in environments where Taguette is integrated with single sign-on or other authentication systems, increasing the risk of credential theft. However, since exploitation requires user interaction and does not grant direct system access, the overall impact remains medium. Prompt patching and user awareness can effectively mitigate these risks.

European organizations should immediately upgrade all Taguette instances to version 1.5.2 or later to eliminate the vulnerability. Until upgrades are complete, implement strict input validation on the 'next' parameter to allow only internal URLs or a whitelist of trusted domains, preventing redirection to arbitrary external sites. Employ web application firewalls (WAFs) with rules to detect and block suspicious redirect patterns. Educate users about the risks of clicking on unexpected or suspicious links, especially those purporting to lead to Taguette resources. Monitor logs for unusual redirect activity and phishing attempts. Additionally, consider implementing multi-factor authentication (MFA) to reduce the impact of credential theft resulting from phishing. Regularly review and audit third-party tools like Taguette for security updates and vulnerabilities to maintain a strong security posture.