CVE Feed

    Dashboard / CVE / CVE-2026-33347

    CVE-2026-33347

    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.

    Published:Mar 24, 2026
    Last Modified:Apr 9, 2026
    EPS:Mar 24, 2026
    EPSS Score:0.00057
    CVSS Score:6.1

    Affected Products

    Vendor
    Thephpleague
    Product
    Commonmark

    Exploits

    No exploit reference

    Related CVEs

    CVE-2024-58382 (CVSS 8.7) — league/commonmark versions before 2.6.0 contain polynomial time complexity vulnerabilities in Markdown parsing…
    CVE-2026-86435 (CVSS 8.7) — commonmark versions from 1.5.0 before 2.8.4 contain a denial of service vulnerability in the Footnote extensio…
    CVE-2026-86434 (CVSS 8.7) — league/commonmark versions >= 2.0.0 and < 2.8.4 (patched in 2.9.0) contain a denial of service vulnerability i…
    CVE-2026-86433 (CVSS 8.7) — commonmark versions from 1.5.0 before 2.8.4 contain a denial of service vulnerability in the Attributes extens…
    CVE-2026-86432 (CVSS 6.9) — commonmark versions from 2.0.0 before 2.8.4 contain a denial of service vulnerability in XmlRenderer that emit…
    CVE-2026-86431 (CVSS 6.9) — league/commonmark (thephpleague/commonmark) versions >= 2.7.0 and < 2.9.1 contain a cross-site scripting vulne…
    CVE-2026-86430 (CVSS 8.7) — league/commonmark versions before 2.9.1 contain multiple denial of service vulnerabilities in fenced code bloc…
    CVE-2026-86429 (CVSS 8.7) — The league/commonmark (thephpleague/commonmark) library in versions >= 1.5.0 and < 2.9.1 contains quadratic pa…
    CVE-2026-86428 (CVSS 8.7) — commonmark versions from 1.5.0 before 2.10.0 contain a denial of service vulnerability in the AttributesExtens…
    CVE-2026-71488 (CVSS 7.5) — league/commonmark is a PHP library for parsing and rendering CommonMark Markdown. From 0.6.0 until 2.9.0, spec…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High