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A arbitrary file read vulnerability exists in Jenkins 2.132 and earlier, 2.121.1 and earlier in the Stapler web framework's org/kohsuke/stapler/Stapler.java that allows attackers to send crafted HTTP requests returning the contents of any file on the Jenkins master file system that the Jenkins master has access to.
Use Jenkins vendor hub and Jenkins product page to widen CVE-2018-1999002 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2026-33001, CVE-2026-27099 and CVE-2026-33002 for nearby disclosures in the same product family.