CVE-2020-4046: Authenticated XSS through embed block in WordPress
First published: Fri Jun 12 2020(Updated: )
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).
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| WordPress WordPress | >=3.7<3.7.34 | |
| WordPress WordPress | >=3.8<3.8.34 | |
| WordPress WordPress | >=3.9<3.9.32 | |
| WordPress WordPress | >=4.0<4.0.31 | |
| WordPress WordPress | >=4.1<4.1.31 | |
| WordPress WordPress | >=4.2<4.2.28 | |
| WordPress WordPress | >=4.3<4.3.24 | |
| WordPress WordPress | >=4.4<4.4.23 | |
| WordPress WordPress | >=4.5<4.5.22 | |
| WordPress WordPress | >=4.6<4.6.19 | |
| WordPress WordPress | >=4.7<4.7.18 | |
| WordPress WordPress | >=4.8<4.8.14 | |
| WordPress WordPress | >=4.9<4.9.15 | |
| WordPress WordPress | >=5.0<5.0.10 | |
| WordPress WordPress | >=5.1<5.1.6 | |
| WordPress WordPress | >=5.2<5.2.7 | |
| WordPress WordPress | >=5.3.0<5.3.4 | |
| WordPress WordPress | >=5.4<5.4.2 | |
| Debian Debian Linux | =8.0 | |
| Debian Debian Linux | =9.0 | |
| Fedoraproject Fedora | =31 | |
| Fedoraproject Fedora | =32 |
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Reference Links
- https://github.com/WordPress/wordpress-develop/security/advisories/GHSA-rpwf-hrh2-39jf
- https://lists.debian.org/debian-lts-announce/2020/07/msg00000.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/773N2ZV7QEMBGKH6FBKI6Q5S3YJMW357/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ODNHXVJS25YVWYQHOCICXTLIN5UYJFDN/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/773N2ZV7QEMBGKH6FBKI6Q5S3YJMW357/
Frequently Asked Questions
What is the vulnerability ID for this WordPress vulnerability?
The vulnerability ID for this WordPress vulnerability is CVE-2020-4046.
What is the severity level of CVE-2020-4046?
The severity level of CVE-2020-4046 is medium with a CVSS score of 5.4.
Which users are affected by CVE-2020-4046?
Users with low privileges (like contributors and authors) are affected by CVE-2020-4046.
How can the affected users exploit this vulnerability?
Affected users can use the embed block in a certain way to inject unfiltered HTML in the block editor.
What is the impact of CVE-2020-4046?
The vulnerability could lead to script execution in the editor/wp-admin when affected posts are viewed by a higher privileged user.
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