social-media-skeleton is an uncompleted social media project. A SQL injection vulnerability in the project allows UNION based injections, which indirectly leads to remote code execution. Commit 3cabdd35c3d874608883c9eaf9bf69b2014d25c1 contains a fix for this issue.
https://github.com/fobybus/social-media-skeleton/security/advisories/GHSA-857x-p6fq-mgfh
https://github.com/fobybus/social-media-skeleton/commit/3cabdd35c3d874608883c9eaf9bf69b2014d25c1