CVE-2019-20041 Information

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.

CVSS Vector

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

Reference

https://github.com/WordPress/wordpress-develop/commit/b1975463dd995da19bb40d3fa0786498717e3c53 https://lists.debian.org/debian-lts-announce/2020/01/msg00010.html https://seclists.org/bugtraq/2020/Jan/8 https://wordpress.org/news/2019/12/wordpress-5-3-1-security-and-maintenance-release/ https://www.debian.org/security/2020/dsa-4599 https://www.debian.org/security/2020/dsa-4677

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8