CVE-2023-40348: 
Java vulnerability analysis and mitigation

The Jenkins Gogs Plugin version 1.0.15 and earlier contains an information disclosure vulnerability (CVE-2023-40348) that affects its webhook endpoint. The vulnerability was discovered and disclosed on August 16, 2023, impacting the plugin's webhook functionality at /gogs-webhook. This security issue affects all versions of the Gogs Plugin up to and including version 1.0.15 (Jenkins Advisory, OSS Security).

The vulnerability exists in the webhook endpoint /gogs-webhook which provides information about the existence of jobs in its output. The webhook endpoint reveals whether a job corresponding to an attacker-specified job name exists, even when the attacker has no permission to access it. The vulnerability has been assigned a Medium severity rating according to CVSS scoring (Jenkins Advisory).

The vulnerability allows unauthenticated attackers to enumerate and discover the existence of Jenkins jobs through the webhook endpoint, even when they don't have permission to access these jobs. This information disclosure could potentially be used for reconnaissance purposes or as part of a larger attack strategy (Jenkins Advisory).

As of the advisory's publication date, there is no official fix available for this vulnerability. Users of the Gogs Plugin should consider implementing additional security controls or access restrictions to the webhook endpoint to minimize potential exploitation (Jenkins Advisory).

Security researchers have recommended that Jenkins should not be exposed to the public Internet due to its large attack surface, and have suggested implementing a process for removing plugins whose maintainers do not resolve security vulnerabilities in a timely manner (OSS Security).