CVE-2016-4986 Jenkins CVE debrief

Who should care

Jenkins administrators and operators who have the TAP plugin installed, especially on internet-reachable or broadly accessible Jenkins instances. Security teams should also prioritize this if Jenkins is used in build pipelines that may expose sensitive source code, credentials, or configuration files.

Technical summary

NVD describes the flaw as a directory traversal vulnerability in the TAP plugin before version 1.25. The attack surface is remote and requires no authentication or user interaction. The reported impact is confidentiality-only: an attacker may be able to read arbitrary files via an unspecified parameter. NVD maps the weakness to CWE-22 and assigns CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Defensive priority

High. The issue is remotely reachable, requires no privileges, and can expose sensitive files. If the TAP plugin is installed, it should be treated as an urgent patching and exposure-review item.

Recommended defensive actions

• Check whether the Jenkins TAP plugin is installed on any Jenkins controller or shared environment.
• Upgrade the TAP plugin to version 1.25 or later, as NVD marks versions before 1.25 as vulnerable.
• If immediate upgrading is not possible, reduce exposure to Jenkins and restrict access to trusted networks and users.
• Review Jenkins logs and surrounding file-access telemetry for signs of unusual requests against the TAP plugin.
• Assess whether sensitive files accessible to the Jenkins process could be exposed and rotate any credentials that may have been readable.

Evidence notes

The NVD record states that the vulnerable component is the Jenkins TAP plugin before 1.25 and describes remote arbitrary file read via directory traversal. NVD also lists CWE-22 and the CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. The vendor advisory referenced by NVD is the Jenkins Security Advisory 2016-06-20.

Official resources