CVE-2025-53661 identifies a vulnerability in the Jenkins Testsigma Test Plan run Plugin versions 1.6 and earlier, where the plugin fails to mask Testsigma API keys on the Jenkins job configuration form. This issue corresponds to CWE-522, which concerns insufficiently protected credentials. Jenkins is a widely used automation server for continuous integration and continuous delivery (CI/CD), and the Testsigma plugin integrates test plan execution capabilities. The exposed API keys are sensitive credentials that allow access to Testsigma services, and their visibility in the configuration UI means that any user with access to the Jenkins job configuration can view and potentially misuse these keys. The vulnerability requires at least low privileges (PR:L) but no user interaction (UI:N) and can be exploited remotely (AV:N). The impact is limited to confidentiality loss (C:L) without affecting integrity or availability. No patches or mitigations have been officially released at the time of publication, and no known exploits are reported in the wild. This vulnerability highlights the importance of credential masking in CI/CD tools to prevent credential leakage and unauthorized access.

For European organizations, this vulnerability poses a risk primarily to the confidentiality of sensitive API keys used in automated testing workflows. If attackers gain access to these keys, they could manipulate or extract data from Testsigma services, potentially leading to unauthorized test executions or data leakage. While the vulnerability does not directly compromise system integrity or availability, the exposure of credentials can serve as a foothold for further attacks within the development pipeline. Organizations relying heavily on Jenkins for CI/CD, especially those integrating Testsigma for test automation, may face increased risk of insider threats or lateral movement by attackers who have low-level access to Jenkins. The risk is heightened in environments where access controls to Jenkins job configurations are weak or where multiple users share Jenkins credentials. Given the medium CVSS score, the impact is moderate but should not be underestimated in environments with sensitive development and testing data.

European organizations should implement the following specific mitigations: 1) Immediately review and restrict access permissions to Jenkins job configuration forms to only trusted personnel. 2) Rotate all exposed Testsigma API keys to invalidate any potentially compromised credentials. 3) Monitor Jenkins logs and audit trails for unusual access patterns or unauthorized configuration changes. 4) Until an official patch is released, consider removing or disabling the Testsigma Test Plan run Plugin if it is not essential. 5) Implement network segmentation and access controls to limit exposure of Jenkins servers to trusted networks and users. 6) Educate development and DevOps teams about the risks of credential exposure and enforce best practices for secret management, such as using Jenkins credentials plugins that mask sensitive data. 7) Stay updated with Jenkins security advisories for any forthcoming patches addressing this vulnerability.