XSS in WordPress
CVE-2020-4049
In affected versions of WordPress, when uploading themes, the name of the theme folder can be crafted in a way that could lead to JavaScript execution in /wp-admin on the themes page. This does require an admin to upload the theme, and is low severity self-XSS. 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 2.4 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.025 (84.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · 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, 10.0
- Fedoraproject Fedora — versions 31, 32
Weakness classification (CWE)
Public proof-of-concept exploits
References
- wordpress.org/news/2020/06/wordpress-5-4-2-security-and-maintenance-release/ (Vendor Advisory)
- github.com/WordPress/wordpress-develop/security/advisories/GHSA-87h4-phjv-rm6p (Third Party Advisory)
- github.com/WordPress/wordpress-develop/commit/404f397b4012fd9d382e55bf7d206c131… (Patch, Third Party 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)
- lists.debian.org/debian-lts-announce/2020/09/msg00011.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-4049?
- CVE-2020-4049 is a low-severity vulnerability in WordPress, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 2.4/10. Published 2020-06-12.
- How severe is CVE-2020-4049?
- Low severity. CVSS v3 base score is 2.4 out of 10.
- Is CVE-2020-4049 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.