CVE-2020-4047 Authenticated XSS via media attachment page in WordPress
Authenticated users with upload permissions can inject JavaScript into media attachment pages, leading to script execution in the context of higher-privileged users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-4047?
CVE-2020-4047 is a medium-severity cross-site scripting vulnerability in Debian Debian Linux, published on 12 Jun 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
In affected versions of WordPress, authenticated users with upload permissions (like authors) are able to inject JavaScript into some media file attachment pages in a certain way. This can lead to script execution in the context of a higher privileged user when the file is viewed by them. 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).
Weakness: CWE-80
Which versions are affected by CVE-2020-4047?
2 open source packages ship an affected version, including wordpress and wordpress-multisite. It affects 3 products.
| Package | Affected | Fixed in |
|---|---|---|
wordpress Bitnami | From 3.7.0 | 3.7.34, 3.8.34, 3.9.32, 4.0.31, 4.1.31, 4.2.28, 4.3.24, 4.4.23, 4.5.22, 4.6.19, 4.7.18, 4.8.14, 4.9.15, 5.0.10, 5.1.6, 5.2.7, 5.3.4, 5.4.2 |
wordpress-multisite Bitnami | From 3.7.0 | 3.7.34, 3.8.34, 3.9.32, 4.0.31, 4.1.31, 4.2.28, 4.3.24, 4.4.23, 4.5.22, 4.6.19, 4.7.18, 4.8.14, 4.9.15, 5.0.10, 5.1.6, 5.2.7, 5.3.4, 5.4.2 |
Products include Debian Debian Linux, Fedoraproject Fedora, Wordpress Wordpress.
How do I fix CVE-2020-4047?
Upgrade wordpress to a fixed version for your release line: 3.7.34, 3.8.34, 3.9.32 or 4.0.31.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2020-4047 being exploited?
There is no known exploitation of CVE-2020-4047 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as BIT-wordpress-2020-4047, BIT-wordpress-multisite-2020-4047, DEBIAN-CVE-2020-4047, GHSA-8q2w-5m27-wm27, UBUNTU-CVE-2020-4047.