CVE-2022-46683 is a vulnerability identified in the Jenkins Google Login Plugin versions 1.4 through 1.6 inclusive. The core issue lies in the plugin's improper validation of redirect URLs following user authentication via Google OAuth. Specifically, the plugin fails to correctly verify that the redirect URL after login legitimately points back to the Jenkins instance. This flaw corresponds to an open redirect vulnerability (CWE-601), which can be exploited by an attacker to redirect authenticated users to arbitrary external URLs. The vulnerability has a CVSS 3.1 base score of 6.1 (medium severity), with the vector indicating that the attack can be performed remotely (AV:N), requires no privileges (PR:N), but does require user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. The impact affects confidentiality and integrity at a low level, with no impact on availability. Although no known exploits are reported in the wild, the vulnerability could be leveraged in phishing or social engineering attacks to redirect users to malicious sites after login, potentially leading to credential theft or session hijacking. The vulnerability is specific to Jenkins instances using the Google Login Plugin for authentication, which is common in organizations leveraging Jenkins for continuous integration and delivery pipelines. No official patches are linked in the provided data, so mitigation may require plugin updates or configuration changes.

For European organizations, the vulnerability poses a moderate risk primarily to the confidentiality and integrity of Jenkins user sessions. Jenkins is widely used in software development environments across Europe, especially in sectors with strong DevOps adoption such as finance, telecommunications, and manufacturing. An attacker exploiting this vulnerability could redirect authenticated users to malicious sites, potentially facilitating credential phishing or session token theft. This could lead to unauthorized access to Jenkins pipelines, source code repositories, or deployment environments, increasing the risk of supply chain attacks or code tampering. While availability is not directly impacted, the indirect consequences of compromised Jenkins credentials could disrupt development workflows and delay critical software releases. Organizations with strict compliance requirements (e.g., GDPR) may face regulatory scrutiny if such an incident leads to data breaches. The lack of known exploits suggests the threat is not yet widespread, but the ease of exploitation (no privileges required, only user interaction) means targeted attacks could emerge, especially against high-value targets.

1. Upgrade the Jenkins Google Login Plugin to a version beyond 1.6 where the vulnerability is fixed, as soon as an official patch is available. 2. In the interim, restrict the use of the Google Login Plugin by limiting authentication to trusted users and IP ranges to reduce exposure. 3. Implement strict Content Security Policy (CSP) headers and browser security controls to mitigate the impact of open redirects. 4. Educate users about the risk of phishing and suspicious redirects post-login to reduce successful social engineering. 5. Monitor Jenkins logs for unusual redirect URL patterns or login anomalies that could indicate exploitation attempts. 6. Consider disabling the Google Login Plugin temporarily if alternative secure authentication methods are available. 7. Employ multi-factor authentication (MFA) for Jenkins access to reduce the risk from compromised credentials. 8. Conduct regular security audits of Jenkins plugins and configurations to detect and remediate similar vulnerabilities proactively.