Silverstripe XSS in shortcodesGHSA-9cx2-hj6m-fv58
MEDIUMGHSA-9cx2-hj6m-fv58 is a medium-severity (CVSS 5.4) Cross-site Scripting (XSS) vulnerability in silverstripe/assets. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for silverstripe/assets — see the affected versions and patch details below.
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-9cx2-hj6m-fv58.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
silverstripe/assets🐘silverstripe/frameworkReal-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
A malicious content author could add arbitrary attributes to HTML editor shortcodes which could be used to inject a JavaScript payload on the front end of the site. The shortcode providers that ship with Silverstripe CMS have been reviewed and attribute whitelists have been implemented where appropriate to negate this risk.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | silverstripe/assets | ≥ 1.0.0&&< 1.11.1 | 1.11.1composer require silverstripe/assets:^1.11.1 |
| 🐘Packagist | silverstripe/framework | ≥ 4.0.0&&< 4.11.13 | 4.11.13composer require silverstripe/framework:^4.11.13 |
Affected Products
asset adminsilverstripeassetssilverstripeframeworksilverstripeResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for silverstripe/assets, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update silverstripe/assets to 1.11.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9cx2-hj6m-fv58 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.
Frequently Asked Questions
Is GHSA-9cx2-hj6m-fv58 in your dependencies?
Find it across Packagist, including transitive dependencies.