GHSA-779c-7w4p-2c4g
LOWSilverstripe admin XSS Vulnerability via WYSIWYG editor
Blast Radius
silverstripe/admin🐘silverstripe/adminReal-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
It is possible for a bad actor with access to the CMS to make use of onmouseover or onmouseout attributes in the WYSIWYG editor to embed malicious javascript.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | silverstripe/admin | ≥ 1.0.3&&< 1.0.4 | 1.0.4 |
| 🐘Packagist | silverstripe/admin | ≥ 1.1.0&&< 1.1.1 | 1.1.1 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for silverstripe/admin. 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.
Fix
Update silverstripe/admin to 1.0.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-779c-7w4p-2c4g is resolved across your whole dependency graph.
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.
How O3 protects you
O3 pinpoints whether GHSA-779c-7w4p-2c4g 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-779c-7w4p-2c4g. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-779c-7w4p-2c4g in your dependencies?
O3 detects GHSA-779c-7w4p-2c4g across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.