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CVE-2026-33347
Published: Mar 24, 2026
Modified: Mar 26, 2026
PUBLISHED
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.
| Vendor | Product | Versions |
|---|---|---|
thephpleague | commonmark | affected >= 2.3.0, < 2.8.2 |
References
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