MediumGHSA-gvrw-qqp5-jgc5CVE-2026-54720
Silverstripe Framework: Possible XSS attack through media embed
Published 27 Aug 2026 · Updated 27 Aug 2026
Affected package
silverstripe/frameworkComposer
- Affected
- <6.2.2
- Fixed in
- 6.2.2
Update to the fixed version for your release line, for example:
composer require silverstripe/framework:^6.2.2Details
Impact
The "Insert media from web" functionality in the CMS is vulnerable to XSS from a specially crafted embed.
Reported by
Jack Wallace from Bastion Security
Is GHSA-gvrw-qqp5-jgc5 in any of your client repos?
Checking one package by hand is fine. Checking it across forty client projects is not. NPMscan reads the lockfiles in every GitHub repo you pick, finds each project with an affected silverstripe/framework, and gives you the command that fixes it.
References
- Linkgithub.com/silverstripe/silverstripe-framework/security/advisories/GHSA-gvrw-qqp5-jgc5
- Advisorynvd.nist.gov/vuln/detail/CVE-2026-54720
- Linkgithub.com/silverstripe/silverstripe-framework/pull/11993
- Linkgithub.com/silverstripe/silverstripe-framework/commit/1bcb02adfc365c6436dc26ab2f6dd32d97f3979b
- Linkgithub.com/FriendsOfPHP/security-advisories/blob/master/silverstripe/framework/CVE-2026-54720.yaml
- Packagegithub.com/silverstripe/silverstripe-framework
- Linkgithub.com/silverstripe/silverstripe-framework/releases/tag/6.2.2
- Linkwww.silverstripe.org/download/security-releases/cve-2026-54720
Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.