CVE-2026-33347

N/A

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.

CVE Details

CVSS v3.1 ScoreN/A

Published3/24/2026

Last Modified3/25/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-79CWE-185CWE-918

References

https://github.com/thephpleague/commonmark/commit/59fb075d2101740c337c7216e3f32b36c204218b(security-advisories@github.com)

https://github.com/thephpleague/commonmark/releases/tag/2.8.2(security-advisories@github.com)

https://github.com/thephpleague/commonmark/security/advisories/GHSA-hh8v-hgvp-g3f5(security-advisories@github.com)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.