CVE-2020-11026 Specially crafted filenames in WordPress leading to XSS
Authenticated users can trigger script execution by uploading files with specially crafted names to the WordPress Media section.
- 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-2020-11026?
CVE-2020-11026 is a high-severity cross-site scripting vulnerability in Debian Debian Linux, published on 30 Apr 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, files with a specially crafted name when uploaded to the Media section can lead to script execution upon accessing the file. This requires an authenticated user with privileges to upload files. This has been patched in version 5.4.1, along with all the previously affected versions via a minor release (5.3.3, 5.2.6, 5.1.5, 5.0.9, 4.9.14, 4.8.13, 4.7.17, 4.6.18, 4.5.21, 4.4.22, 4.3.23, 4.2.27, 4.1.30, 4.0.30, 3.9.31, 3.8.33, 3.7.33).
Which versions are affected by CVE-2020-11026?
2 open source packages ship an affected version, including wordpress and wordpress-multisite. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
wordpress Bitnami | From 3.7.0 | 3.7.33, 3.8.33, 3.9.31, 4.0.30, 4.1.30, 4.2.27, 4.3.23, 4.4.22, 4.5.21, 4.6.18, 4.7.17, 4.8.13, 4.9.14, 5.0.9, 5.1.5, 5.2.6, 5.3.3, 5.4.1 |
wordpress-multisite Bitnami | From 3.7.0 | 3.7.33, 3.8.33, 3.9.31, 4.0.30, 4.1.30, 4.2.27, 4.3.23, 4.4.22, 4.5.21, 4.6.18, 4.7.17, 4.8.13, 4.9.14, 5.0.9, 5.1.5, 5.2.6, 5.3.3, 5.4.1 |
Products include Debian Debian Linux, Wordpress Wordpress.
How do I fix CVE-2020-11026?
Upgrade wordpress to a fixed version for your release line: 3.7.33, 3.8.33, 3.9.31 or 4.0.30.
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-2020-11026 being exploited?
There is no known exploitation of CVE-2020-11026 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as BIT-wordpress-2020-11026, BIT-wordpress-multisite-2020-11026, DEBIAN-CVE-2020-11026, GHSA-3gw2-4656-pfr2, UBUNTU-CVE-2020-11026.