Stored XSS due to Unrestricted File Upload in GitHub repository star7th/showdoc prior to 2.10.4.
https://github.com/advisories/GHSA-9fcc-7g44-mxrj
https://huntr.dev/bounties/a412707c-18da-4c84-adc0-9801ed8068c9
https://github.com/star7th/showdoc/commit/3caa32334db0c277b84e993eaca2036f5d1dbef8