XSS in WordPress
CVE-2020-4046
In affected versions of WordPress, users with low privileges (like contributors and authors) can use the embed block in a certain way to inject unfiltered HTML in the block editor. When affected posts are viewed by a higher privileged user, this could lead to script execution in the editor/wp-admin. This has been patched in version 5.4.2, along with all the previously affected versions via a minor release (5.3.4, 5.2.7, 5.1.6, 5.0.10, 4.9.15, 4.8.14, 4.7.18, 4.6.19, 4.5.22, 4.4.23, 4.3.24, 4.2.28, 4.1.31, 4.0.31, 3.9.32, 3.8.34, 3.7.34).
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.021 (81.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000
Affected products
- WordPress
- WordPress Wordpress-Develop — versions >= 5.4.0, < 5.4.2, >= 5.3.0, < 5.3.4, >= 5.2.0, < 5.2.7
- Debian Linux — versions 8.0, 9.0
- Fedoraproject Fedora — versions 31, 32
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/WordPress/wordpress-develop/security/advisories/GHSA-rpwf-hrh2-39jf (Third Party Advisory)
- wordpress.org/news/2020/06/wordpress-5-4-2-security-and-maintenance-release/ (Vendor Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.debian.org/security/2020/dsa-4709 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2020/07/msg00000.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-4046?
- CVE-2020-4046 is a medium-severity vulnerability in WordPress, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 5.4/10. Published 2020-06-12.
- How severe is CVE-2020-4046?
- Medium severity. CVSS v3 base score is 5.4 out of 10.
- Is CVE-2020-4046 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.