CVE-2025-46826 is a security vulnerability classified as CWE-601, an 'Open Redirect' issue found in the insa-auth authentication server component of the INSAgenda product, used by INSA Rouen. The vulnerability allowed third-party websites to redirect users to the server's secondary authentication bridge, potentially exposing basic student information such as names and student numbers. This open redirect flaw could be exploited by attackers to craft malicious URLs that redirect users to untrusted sites, possibly facilitating phishing attacks or information disclosure. However, the vulnerability was assessed as low severity due to its limited impact, minimal data exposure, and the fact that it did not require authentication or privileged access. The issue was promptly fixed on May 3, 2025, prior to any known exploitation in the wild. The CVSS 4.0 base score is 1.3, reflecting the low confidentiality impact and the requirement for user interaction (clicking a malicious link). The vulnerability affects versions of insa-auth prior to the patch date. Overall, this vulnerability represents a minor risk primarily related to user redirection and limited information disclosure in an academic authentication context.

For European organizations, particularly educational institutions using INSAgenda or similar authentication systems, the impact of this vulnerability is minimal but non-negligible. The exposure of basic student information such as names and numbers could lead to privacy concerns under GDPR, especially if combined with other data. The open redirect could be leveraged in phishing campaigns targeting students or staff, potentially undermining trust in the institution's authentication processes. However, since the vulnerability does not allow access to sensitive credentials or broader system compromise, the direct operational impact is low. The prompt patching and absence of known exploitation further reduce the risk. Nonetheless, organizations should be aware that even minor open redirect vulnerabilities can be stepping stones for social engineering attacks, which are common in academic environments.

Organizations should ensure that all instances of insa-auth are updated to versions released after May 3, 2025, which contain the fix for this vulnerability. Beyond patching, administrators should review and restrict URL redirection mechanisms to only allow trusted domains and implement strict validation of redirect targets. User education campaigns should be conducted to raise awareness about phishing attempts that exploit open redirects. Additionally, logging and monitoring of authentication server access should be enhanced to detect unusual redirect patterns or suspicious access attempts. Implementing Content Security Policy (CSP) headers and anti-phishing tools can further mitigate risks associated with open redirects. Finally, organizations should regularly audit their authentication flows for similar vulnerabilities to prevent recurrence.