HTML5 Entity Bypass in WordPress by Automattic
CVE-2019-20041

9.8CRITICAL

Key Information:

Vendor

Wordpress
Status
WordPress
Vendor
CVE Published:
27 December 2019

What is CVE-2019-20041?

The wp_kses_bad_protocol function in WordPress prior to version 5.3.1 is vulnerable to an input sanitization bypass. This flaw arises from its mishandling of the HTML5 colon named entity. Attackers exploiting this vulnerability can potentially pass malicious inputs that are not properly filtered, which could lead to JavaScript execution in contexts where it should be blocked, compromising site integrity and user security.

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References

https://wordpress.org/news/2019/12/wordpress-5-3-1-securi...
x_refsource_MISC
https://github.com/WordPress/wordpress-develop/commit/b19...
x_refsource_MISC
https://seclists.org/bugtraq/2020/Jan/8
mailing-listx_refsource_BUGTRAQ

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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