CVE-2022-43410 is a medium-severity information disclosure vulnerability found in the Jenkins Mercurial Plugin, specifically in versions up to 1251.va_b_121f184902 and earlier. Jenkins is a widely used open-source automation server that facilitates continuous integration and continuous delivery (CI/CD). The Mercurial Plugin integrates Mercurial version control system support into Jenkins. This vulnerability arises from the plugin's webhook endpoint, which improperly exposes information about which Jenkins jobs were triggered or scheduled for polling. Critically, this information disclosure includes jobs that the querying user does not have permission to access, violating access control principles. The vulnerability is classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). The CVSS v3.1 base score is 5.3, indicating a medium severity level. The attack vector is network-based (AV:N), requires no privileges (PR:N), no user interaction (UI:N), and the impact is limited to confidentiality (C:L) with no impact on integrity or availability. No known exploits are reported in the wild, and no patches are explicitly linked in the provided data, though it is likely that Jenkins or plugin maintainers have addressed this issue in subsequent releases. The vulnerability allows an unauthenticated remote attacker to glean information about Jenkins jobs, potentially aiding in reconnaissance for further attacks or unauthorized access attempts by revealing the structure and scheduling of jobs within the Jenkins environment.

For European organizations, the impact of CVE-2022-43410 primarily concerns confidentiality breaches within their CI/CD pipelines. Jenkins is widely adopted across industries including finance, manufacturing, technology, and government sectors in Europe. Disclosure of job scheduling and triggering information could reveal sensitive operational details such as build schedules, deployment timings, or project structures. This information could be leveraged by attackers to plan targeted attacks, social engineering, or privilege escalation attempts. While the vulnerability does not directly allow code execution or system compromise, the leakage of job metadata undermines security posture and may facilitate subsequent exploitation of other vulnerabilities. Organizations handling sensitive or regulated data (e.g., GDPR-protected personal data) may face compliance risks if this information disclosure leads to broader security incidents. The lack of required authentication and user interaction increases the risk of automated reconnaissance by malicious actors scanning for vulnerable Jenkins instances across European networks.

To mitigate CVE-2022-43410, European organizations should take the following specific actions: 1) Immediately audit Jenkins instances to identify usage of the Mercurial Plugin and determine the plugin version. 2) Upgrade the Mercurial Plugin to the latest version where this vulnerability is patched; if no official patch exists, consider disabling the Mercurial Plugin until a fix is available. 3) Restrict network access to Jenkins webhook endpoints by implementing firewall rules or network segmentation to limit exposure to trusted IP addresses only. 4) Enforce strict authentication and authorization policies on Jenkins, ensuring that webhook endpoints do not expose sensitive information to unauthenticated users. 5) Monitor Jenkins logs for unusual access patterns or repeated requests to webhook endpoints that could indicate reconnaissance attempts. 6) Incorporate Jenkins security best practices such as running Jenkins behind a reverse proxy with authentication, and regularly reviewing plugin security advisories. 7) Conduct internal security awareness to inform DevOps and security teams about this vulnerability and the importance of securing CI/CD infrastructure.