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.
History

Fri, 27 Mar 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 25 Mar 2026 12:00:00 +0000

Type Values Removed Values Added
First Time appeared Thephpleague
Thephpleague commonmark
Vendors & Products Thephpleague
Thephpleague commonmark

Tue, 24 Mar 2026 19:45:00 +0000

Type Values Removed Values Added
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.
Title league/commonmark has an embed extension allowed_domains bypass
Weaknesses CWE-185
CWE-79
CWE-918
References
Metrics cvssV4_0

{'score': 6.3, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-03-24T19:26:23.872Z

Updated: 2026-03-26T19:52:12.754Z

Reserved: 2026-03-18T22:15:11.814Z

Link: CVE-2026-33347

cve-icon Vulnrichment

Updated: 2026-03-26T19:51:17.892Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-24T20:16:29.240

Modified: 2026-03-25T15:41:58.280

Link: CVE-2026-33347

cve-icon Redhat

No data.