Jenkins 2.274 and earlier, LTS 2.263.1 and earlier improperly validates the format of a provided fingerprint ID when checking for its existence allowing an attacker to check for the existence of XML files with a short path.
https://github.com/advisories/GHSA-f585-9fw3-rj2m
https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2023