MEDIUM 5.4
GHSA-gvrw-qqp5-jgc5
Silverstripe Framework: Possible XSS attack through media embed
Quick fix
GHSA-gvrw-qqp5-jgc5 — silverstripe/framework: upgrade to the fixed version with the command below.
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
Are you affected?
Enter the version of the package you're using.
Affected packages
Packagist / silverstripe/framework
Introduced in:
0 Fixed in: 6.2.2 Fix
composer require silverstripe/framework:^6.2.2 References
- https://github.com/silverstripe/silverstripe-framework/security/advisories/GHSA-gvrw-qqp5-jgc5 [WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-54720 [ADVISORY]
- https://github.com/silverstripe/silverstripe-framework/pull/11993 [WEB]
- https://github.com/silverstripe/silverstripe-framework/commit/1bcb02adfc365c6436dc26ab2f6dd32d97f3979b [WEB]
- https://github.com/FriendsOfPHP/security-advisories/blob/master/silverstripe/framework/CVE-2026-54720.yaml [WEB]
- https://github.com/silverstripe/silverstripe-framework [PACKAGE]
- https://github.com/silverstripe/silverstripe-framework/releases/tag/6.2.2 [WEB]
- https://www.silverstripe.org/download/security-releases/cve-2026-54720 [WEB]