CVE-2025-64150 identifies a security vulnerability in the Jenkins Publish to Bitbucket Plugin version 0.4 and earlier, where a missing permission check allows users with Overall/Read permission to misuse the plugin's functionality. Specifically, the flaw permits these users to initiate connections to attacker-controlled URLs using credentials IDs that the attacker has obtained through other means. This results in the potential exposure of sensitive credentials stored within Jenkins. The vulnerability arises because the plugin does not properly verify whether the user has the necessary permissions to use the specified credentials, allowing unauthorized access. Since Overall/Read permission is relatively low-level and often granted to many users, the attack surface is broad. The attacker can leverage this to exfiltrate credentials, which could then be used to escalate privileges or compromise integrated systems such as Bitbucket repositories. No CVSS score has been assigned yet, and no exploits have been reported in the wild, but the vulnerability is publicly disclosed and should be treated seriously. The affected plugin version is 0.4 and earlier, and the vulnerability was published on October 29, 2025. The issue is particularly relevant for organizations using Jenkins in their CI/CD pipelines with Bitbucket integration, as stolen credentials could lead to further compromise of source code repositories and deployment environments.

For European organizations, this vulnerability poses a significant risk to the confidentiality and integrity of their software development lifecycle. Compromise of Jenkins credentials can lead to unauthorized access to source code repositories, enabling code tampering, intellectual property theft, or insertion of malicious code. This can disrupt software delivery and damage organizational reputation. The vulnerability's exploitation requires only Overall/Read permission, which is commonly granted, increasing the likelihood of insider threats or exploitation by compromised accounts. Given the widespread use of Jenkins in Europe, especially in countries with strong software development sectors, the impact could be broad. Additionally, stolen credentials could facilitate lateral movement within networks, leading to further breaches. The absence of known exploits in the wild suggests a window for proactive mitigation, but the potential impact remains high due to the critical nature of CI/CD environments and the sensitivity of credentials involved.

Organizations should immediately audit and restrict Overall/Read permissions in Jenkins to only trusted users, minimizing the number of accounts that can exploit this vulnerability. They should monitor and review credential usage logs for suspicious activity. Upgrading the Jenkins Publish to Bitbucket Plugin to a patched version once released is essential to fully remediate the issue. In the interim, consider disabling or removing the plugin if it is not critical to operations. Implement network segmentation and firewall rules to limit Jenkins server outbound connections, reducing the risk of data exfiltration to attacker-controlled URLs. Employ credential vaulting and rotation policies to limit the impact of any stolen credentials. Additionally, enforce multi-factor authentication for Jenkins access and regularly review user permissions to adhere to the principle of least privilege. Finally, educate developers and administrators about this vulnerability to increase awareness and vigilance.