CVE-2019-20041

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.

Category

9.8
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 2.0 •
EPSS 2.40% Top 20%
Vendor Advisory debian.org Vendor Advisory debian.org Vendor Advisory wordpress.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://wordpress.org/news/2019/12/wordpress-5-3-1-security-and-maintenance-release/ release notes vendor advisory
https://github.com/WordPress/wordpress-develop/commit/b1975463dd995da19bb40d3fa0786498717e3c53 patch
https://seclists.org/bugtraq/2020/Jan/8 third party advisory mailing list
https://www.debian.org/security/2020/dsa-4599 third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2020/01/msg00010.html third party advisory mailing list
https://www.debian.org/security/2020/dsa-4677 third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2019-20041?
CVE-2019-20041 has been scored as a critical severity vulnerability.
How to fix CVE-2019-20041?
To fix CVE-2019-20041, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-20041 being actively exploited in the wild?
It is possible that CVE-2019-20041 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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