GHSA-p4g7-wjhq-9r2h
MEDIUMGHSA-p4g7-wjhq-9r2h is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in paypal/merchant-sdk-php. 1 public exploit reference exists, so weaponization risk is real. O3 Security confirms whether GHSA-p4g7-wjhq-9r2h is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
PayPal PHP Merchant SDK Cross-site scripting (XSS) vulnerability
Real-World Exposure
paypal/merchant-sdk-phpReal-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
Cross-site scripting (XSS) vulnerability in GetAuthDetails.html.php in PayPal PHP Merchant SDK (aka merchant-sdk-php) 3.9.1 allows remote attackers to inject arbitrary web script or HTML via the token parameter.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | paypal/merchant-sdk-php | ≥ 3.0.0&&< 3.12.0 | 3.12.0 |
Research 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 paypal/merchant-sdk-php. 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 paypal/merchant-sdk-php to 3.12.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-p4g7-wjhq-9r2h 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-p4g7-wjhq-9r2h 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-p4g7-wjhq-9r2h. 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-p4g7-wjhq-9r2h in your dependencies?
O3 detects GHSA-p4g7-wjhq-9r2h across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.