CVE-2019-20041
CRITICAL severity · CVSS 9.8 · Improper input validation
9.8CVSS CRITICAL
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)1%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://github.com/WordPress/wordpress-develop/commit/b1975463dd995da19bb40d3fa0786498717e3c53 ↗
Additional information
- NVD record
- https://github.com/WordPress/wordpress-develop/commit/b1975463dd995da19bb40d3fa0786498717e3c53Patch
- https://github.com/WordPress/wordpress-develop/commit/b1975463dd995da19bb40d3fa0786498717e3c53Patch
- https://wordpress.org/news/2019/12/wordpress-5-3-1-security-and-maintenance-release/Advisory
- https://lists.debian.org/debian-lts-announce/2020/01/msg00010.htmlAdvisory
- https://seclists.org/bugtraq/2020/Jan/8Advisory
- https://www.debian.org/security/2020/dsa-4599Advisory
- https://www.debian.org/security/2020/dsa-4677Advisory
- https://lists.debian.org/debian-lts-announce/2020/01/msg00010.htmlAdvisory