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Not in CISA KEV
MEDIUM severity

GHSA-gvrw-qqp5-jgc5 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in silverstripe/framework. O3 Security confirms whether GHSA-gvrw-qqp5-jgc5 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Silverstripe Framework: Possible XSS attack through media embed

Also known asCVE-2026-54720
Published
Aug 27, 2026
Updated
Aug 27, 2026
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Aug 27, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
🐘silverstripe/framework

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistsilverstripe/frameworkall versions6.2.2

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for silverstripe/framework. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update silverstripe/framework to 6.2.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-gvrw-qqp5-jgc5 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether GHSA-gvrw-qqp5-jgc5 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-gvrw-qqp5-jgc5. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### 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
O3 Security · Impact-Aware SCA

Is GHSA-gvrw-qqp5-jgc5 in your dependencies?

O3 detects GHSA-gvrw-qqp5-jgc5 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

GHSA-gvrw-qqp5-jgc5: silverstripe/framework… | O3 Security