CVE-2026-54717 Silverstripe: XSS in breadcrumbs in page list view
Attackers can execute arbitrary scripts in the Silverstripe CMS page list view via unescaped page titles in breadcrumbs, 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-2026-54717?
CVE-2026-54717 is a medium-severity cross-site scripting vulnerability in silverstripe-cms, published on 6 Aug 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 CMS is an open source content management system. Prior to 6.2.1, page breadcrumbs in the CMS are vulnerable to cross-site scripting when viewed using the page list view, because page titles are rendered into the breadcrumb trail without being escaped. This issue is fixed in 6.2.1.
Weakness: CWE-79
Which versions are affected by CVE-2026-54717?
2 open source packages ship an affected version, including silverstripe/cms.
| Package | Affected | Fixed in |
|---|---|---|
silverstripe/cms Packagist | All versions | 6.2.1 |
silverstripe/cms Packagist | All versions | 6.2.1 |
How do I fix CVE-2026-54717?
Upgrade silverstripe/cms to 6.2.1 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-2026-54717 being exploited?
There is no known exploitation of CVE-2026-54717 in the wild and no public exploit code.
Sources
Also known as GHSA-w3cp-g2pf-65wh.