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CVE CVE-2026-33347

CVE-2026-33347

PHP

Severity: —
CVSS: —CVSS
Published: 2026-03-24
Last modified: 2026-03-25
CWE: CWE-79CWE-185CWE-918

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.

References

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

Summary

Description

References