CVE-2026-54720 Silverstripe Framework: Possible XSS attack through media embed
Attackers can execute arbitrary scripts via crafted media embeds in Silverstripe CMS, potentially compromising user sessions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-54720?
CVE-2026-54720 is a medium-severity cross-site scripting vulnerability in silverstripe-framework, published on 1 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Silverstripe Framework is a PHP framework which powers the Silverstripe CMS. In versions prior to 6.2.2, the "Insert media from web" functionality in the CMS is vulnerable to XSS from a specially crafted embed. This issue was fixed in version 6.2.2/
Weakness: CWE-79
Which versions are affected by CVE-2026-54720?
2 open source packages ship an affected version, including silverstripe/framework.
| Package | Affected | Fixed in |
|---|---|---|
silverstripe/framework Packagist | All versions | 6.2.2 |
silverstripe/framework Packagist | All versions | 6.2.2 |
How do I fix CVE-2026-54720?
Upgrade silverstripe/framework to 6.2.2 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 CVE-2026-54720 being exploited?
There is no known exploitation of CVE-2026-54720 in the wild and no public exploit code.
Sources
Also known as GHSA-gvrw-qqp5-jgc5.