CVE-2025-64149 identifies a cross-site request forgery (CSRF) vulnerability in the Jenkins Publish to Bitbucket Plugin, specifically versions 0.4 and earlier. Jenkins is a widely used automation server for continuous integration and continuous delivery (CI/CD), and the Publish to Bitbucket Plugin facilitates integration with Bitbucket repositories. The vulnerability allows an attacker to craft a malicious request that, when executed in the context of an authenticated Jenkins user, can cause Jenkins to connect to an attacker-controlled URL using credentials IDs that the attacker has obtained through other means. This results in the attacker capturing sensitive credentials stored within Jenkins, potentially including repository access tokens or other secrets. The attack vector does not require direct user interaction beyond the victim being authenticated in Jenkins and visiting a malicious page or triggering the CSRF. The vulnerability arises because the plugin fails to properly validate the authenticity of requests, allowing unauthorized commands to be executed. Although no public exploits are currently known, the impact could be significant given Jenkins' role in software development pipelines. The lack of a CVSS score indicates the need for a severity assessment based on impact and exploitability. The vulnerability affects the confidentiality of stored credentials, can lead to unauthorized access to source code repositories, and may facilitate further compromise of development environments.

For European organizations, this vulnerability poses a significant risk to the confidentiality and integrity of software development pipelines. Compromise of Jenkins credentials can lead to unauthorized access to Bitbucket repositories, allowing attackers to steal, modify, or delete source code. This can disrupt development workflows, introduce malicious code, or leak intellectual property. Organizations relying on Jenkins for CI/CD automation, especially those integrating with Bitbucket, face potential operational disruption and reputational damage. The impact extends to compliance risks under GDPR if sensitive data or intellectual property is exposed. Given the widespread use of Jenkins in Europe’s technology and financial sectors, exploitation could affect critical infrastructure and business continuity. The attack does not require user interaction beyond authentication, increasing the risk of unnoticed compromise. Although no exploits are reported in the wild, the vulnerability's nature makes it a high-value target for attackers aiming to infiltrate development environments.

To mitigate this vulnerability, European organizations should immediately audit their Jenkins instances for the presence of the Publish to Bitbucket Plugin version 0.4 or earlier and upgrade to a patched version once available. If no patch exists, consider disabling or removing the plugin until a fix is released. Implement strict access controls on Jenkins credentials, ensuring that only necessary users and services have access. Enable Jenkins' built-in CSRF protection features and verify that all plugins comply with security best practices. Regularly monitor Jenkins logs for unusual activity, such as unexpected connections to external URLs or unauthorized credential usage. Employ network segmentation to limit Jenkins server access and restrict outbound connections to trusted endpoints. Additionally, conduct security awareness training for developers and administrators about the risks of CSRF and credential exposure. Finally, maintain an incident response plan to quickly address any suspected compromise of Jenkins credentials or repositories.