CVE-2019-20041

CriticalCVSS 9.8/10Last modified Jun 17, 2026

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&colon; substring.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-20

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://github.com/WordPress/wordpress-develop/commit/b1975463dd995da19bb40d3fa0786498717e3c53Patch
https://lists.debian.org/debian-lts-announce/2020/01/msg00010.htmlMailing List, Third Party Advisory
https://seclists.org/bugtraq/2020/Jan/8Mailing List, Third Party Advisory
https://wordpress.org/news/2019/12/wordpress-5-3-1-security-and-maintenance-release/Release Notes, Vendor Advisory
https://www.debian.org/security/2020/dsa-4599Third Party Advisory
https://www.debian.org/security/2020/dsa-4677Third Party Advisory
https://github.com/WordPress/wordpress-develop/commit/b1975463dd995da19bb40d3fa0786498717e3c53Patch
https://lists.debian.org/debian-lts-announce/2020/01/msg00010.htmlMailing List, Third Party Advisory
https://seclists.org/bugtraq/2020/Jan/8Mailing List, Third Party Advisory
https://wordpress.org/news/2019/12/wordpress-5-3-1-security-and-maintenance-release/Release Notes, Vendor Advisory
https://www.debian.org/security/2020/dsa-4599Third Party Advisory
https://www.debian.org/security/2020/dsa-4677Third Party Advisory

Timeline

Published: Dec 27, 2019
Last modified: Jun 17, 2026
NVD status: Modified

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