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CVE-2019-20041

CRITICAL 9.8 CVSS 3.1
Published
December 27, 2019
Last modified
June 17, 2026
NVD status
Modified
Reported by
cve@mitre.org
Weakness
CWE-20
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

wp_kses_bad_protocol in wp-includes/kses.php in WordPress before 5.3.1 mishandles the HTML5 colon named entity, allowing attackers to bypass input sanitization, as demonstrated by the javascript: substring.

Affected WordPress components

  • WordPress core
    Confirmed match
    Before 5.3.1

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • n/a n/a — Versions not specified
  • wordpress wordpress — Before 5.3.1

References

  • github.com https://github.com/WordPress/wordpress-develop/commit/b1975463dd995da19bb40d3fa0786498717e3c53 Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2020/01/msg00010.html Mailing List, Third Party Advisory
  • seclists.org https://seclists.org/bugtraq/2020/Jan/8 Mailing List, Third Party Advisory
  • wordpress.org https://wordpress.org/news/2019/12/wordpress-5-3-1-security-and-maintenance-release/ Release Notes, Vendor Advisory
  • www.debian.org https://www.debian.org/security/2020/dsa-4599 Third Party Advisory
  • www.debian.org https://www.debian.org/security/2020/dsa-4677 Third Party Advisory
  • nvd.nist.gov Official NVD record