CVE-2026-33347

league/commonmark has an embed extension allowed_domains bypass

CVSS 6.3 MEDIUMEPSS 0.2%CWE-185 CWE-79 CWE-918

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.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N

Produtos afetados

thephpleague · commonmark

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Referências

https://github.com/thephpleague/commonmark/commit/59fb075d2101740c337c7216e3f32b36c204218b https://github.com/thephpleague/commonmark/releases/tag/2.8.2 https://github.com/thephpleague/commonmark/security/advisories/GHSA-hh8v-hgvp-g3f5