Description
league/commonmark is a PHP Markdown parser. From version 2.3.0 to before version 2.8.2, the DomainFilteringAdapter in the Embed extension is vulnerable to an allowlist bypass due to a missing hostname boundary assertion in the domain-matching regex. An attacker-controlled domain like youtube.com.evil passes the allowlist check when youtube.com is an allowed domain. This issue has been patched in version 2.8.2.
Problem types
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-185: Incorrect Regular Expression
CWE-918: Server-Side Request Forgery (SSRF)
Product status
References
github.com/...onmark/security/advisories/GHSA-hh8v-hgvp-g3f5
github.com/...ommit/59fb075d2101740c337c7216e3f32b36c204218b
github.com/thephpleague/commonmark/releases/tag/2.8.2