The vulnerability identified as CVE-2025-64145 affects the Jenkins ByteGuard Build Actions Plugin version 1.0. The core issue is that API tokens displayed on the job configuration form are not masked, meaning they appear in plain text to any user who can view the configuration. This vulnerability falls under CWE-311, which relates to cleartext transmission or storage of sensitive information. The CVSS v3.1 base score is 4.3 (medium), with an attack vector of network (AV:N), low attack complexity (AC:L), requiring low privileges (PR:L), no user interaction (UI:N), and impacting confidentiality only (C:L), without affecting integrity or availability. The lack of masking increases the risk that an attacker with access to the Jenkins UI or configuration files can capture API tokens, potentially allowing unauthorized access to Jenkins APIs or other integrated services. Since Jenkins is widely used for continuous integration and deployment, exposure of API tokens can lead to further compromise of build pipelines or downstream systems. No patches or fixes have been published yet, and no exploits are known in the wild. The vulnerability is particularly relevant in environments where multiple users have access to Jenkins job configurations or where access controls are insufficiently restrictive. The issue underscores the need for secure credential handling practices within CI/CD tools and plugins.

For European organizations, the exposure of API tokens in Jenkins can lead to unauthorized access to build and deployment pipelines, potentially allowing attackers to manipulate build processes, inject malicious code, or access sensitive project data. This can undermine software integrity and trustworthiness, leading to reputational damage and compliance violations, especially under GDPR if personal data is involved. Organizations with shared Jenkins environments or multi-tenant setups are at higher risk, as attackers with limited privileges could escalate their access by stealing tokens. The medium severity reflects that while the vulnerability does not directly impact system availability or integrity, the confidentiality breach can be a stepping stone for more severe attacks. Given the widespread use of Jenkins in European tech sectors, including finance, manufacturing, and government, the impact could be significant if not addressed promptly.

1. Immediately restrict access to Jenkins job configuration pages to trusted administrators only, minimizing the number of users who can view API tokens. 2. Implement role-based access control (RBAC) and audit logs to monitor who accesses job configurations and API tokens. 3. Rotate all API tokens used in the ByteGuard Build Actions Plugin to invalidate any potentially exposed credentials. 4. Use Jenkins credentials management features that securely store and mask sensitive tokens instead of embedding them directly in job configurations. 5. Monitor Jenkins logs and network traffic for unusual API calls or token usage patterns that could indicate compromise. 6. Until a patch is released, consider disabling or removing the ByteGuard Build Actions Plugin if it is not essential. 7. Educate DevOps teams about the risks of exposing API tokens and enforce secure coding and configuration practices. 8. Follow Jenkins security advisories closely for updates or patches addressing this vulnerability.