mkdocs-include-markdown-plugin is an Mkdocs Markdown includer plugin. In versions 7.1.7 and below, there is a vulnerability where unvalidated input can collide with substitution placeholders. This issue is fixed in version 7.1.8.
https://github.com/mondeja/mkdocs-include-markdown-plugin/security/advisories/GHSA-v39m-5m9j-m9w9
https://github.com/mondeja/mkdocs-include-markdown-plugin/pull/277
https://github.com/mondeja/mkdocs-include-markdown-plugin/issues/274