Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The Packagist package silverstripe/framework, versions before 6.2.2, is vulnerable to cross-site scripting through the "Insert media from web" function in the CMS, which can be triggered by a specially crafted media embed. The source does not say what privileges an attacker needs or exactly what they can do after exploiting it. Upgrade silverstripe/framework to version 6.2.2 or later, which is the fixed version.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 5.4 | Medium | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0026, the 18th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:07 UTC First seen by agentprime
- 31 Oct 2026, 14:07 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-gvrw-qqp5-jgc5
- OSV: GHSA-gvrw-qqp5-jgc5
- github.com/silverstripe/silverstripe-framework/security/advisories/GHSA-gvrw-qqp5-jgc5
- nvd.nist.gov/vuln/detail/CVE-2026-54720
- github.com/silverstripe/silverstripe-framework/pull/11993
- github.com/silverstripe/silverstripe-framework/commit/1bcb02adfc365c6436dc26ab2f6dd32d97f3979b
- github.com/FriendsOfPHP/security-advisories/blob/master/silverstripe/framework/CVE-2026-54720.yaml
- github.com/silverstripe/silverstripe-framework
- github.com/silverstripe/silverstripe-framework/releases/tag/6.2.2
- www.silverstripe.org/download/security-releases/cve-2026-54720