CVE-2020-4049
Status: ModifiedLow (2.4)—
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).
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
- Base score: 2.4
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 2.53%
- Percentile among all scored CVEs: 84
- Score date: 10/8/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (3)
CWEs
- CWE-80
- CWE-79
References
- https://github.com/WordPress/wordpress-develop/commit/404f397b4012fd9d382e55bf7d206c1317f01148
- https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-87h4-phjv-rm6p
- https://lists.debian.org/debian-lts-announce/2020/07/msg00000.html
- https://lists.debian.org/debian-lts-announce/2020/09/msg00011.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/773N2ZV7QEMBGKH6FBKI6Q5S3YJMW357/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ODNHXVJS25YVWYQHOCICXTLIN5UYJFDN/
- https://wordpress.org/news/2020/06/wordpress-5-4-2-security-and-maintenance-release/
- https://www.debian.org/security/2020/dsa-4709
- https://github.com/WordPress/wordpress-develop/commit/404f397b4012fd9d382e55bf7d206c1317f01148
- https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-87h4-phjv-rm6p
- https://lists.debian.org/debian-lts-announce/2020/07/msg00000.html
- https://lists.debian.org/debian-lts-announce/2020/09/msg00011.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/773N2ZV7QEMBGKH6FBKI6Q5S3YJMW357/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ODNHXVJS25YVWYQHOCICXTLIN5UYJFDN/
- https://wordpress.org/news/2020/06/wordpress-5-4-2-security-and-maintenance-release/
- https://www.debian.org/security/2020/dsa-4709
Raw JSON (NVD)
Show
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"value": "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)."
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