GHSA-6hh6-59j2-qrxw Silverstripe History XSS Vulnerability
An attacker with CMS access can inject malicious HTML into page history, leading to XSS when compare mode is used.
- 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 GHSA-6hh6-59j2-qrxw?
GHSA-6hh6-59j2-qrxw is a cross-site scripting vulnerability in silverstripe/cms, published on 22 May 2024. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
A cross-site scripting vulnerability has been discovered in the CMS page history tab.
This vulnerability can only be exploited if a user with CMS access has posted malicious or unescaped HTML into any of the text fields on a page, and if the "compare mode" option is selected. The HTML will be embedded into the page unescaped.
This has been resolved by performing the text comparison in a HTML friendly way.
Which versions are affected by GHSA-6hh6-59j2-qrxw?
2 open source packages ship an affected version, including silverstripe/cms.
| Package | Affected | Fixed in |
|---|---|---|
silverstripe/cms Packagist | From 3.1.0 | 3.1.10 |
silverstripe/cms Packagist | From 3.1.0 | 3.1.10 |
How do I fix GHSA-6hh6-59j2-qrxw?
Upgrade silverstripe/cms to 3.1.10 or later.
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 GHSA-6hh6-59j2-qrxw being exploited?
There is no known exploitation of GHSA-6hh6-59j2-qrxw in the wild and no public exploit code.