CVE-2023-39527 is a high-severity (CVSS 8.3) Cross-site Scripting (XSS) vulnerability in prestashop/prestashop. O3 Security confirms whether CVE-2023-39527 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
PrestaShop XSS vulnerability through Validate::isCleanHTML method
Real-World Exposure
prestashop/prestashop🐘prestashop/prestashop🐘prestashop/prestashopReal-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
PrestaShop is an open source e-commerce web application. Versions prior to 1.7.8.10, 8.0.5, and 8.1.1 are vulnerable to cross-site scripting through the isCleanHTML method. Versions 1.7.8.10, 8.0.5, and 8.1.1 contain a patch. There are no known workarounds.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | prestashop/prestashop | ≥ 8.1.0&&< 8.1.1 | 8.1.1 |
| 🐘Packagist | prestashop/prestashop | ≥ 8.0.0&&< 8.0.5 | 8.0.5 |
| 🐘Packagist | prestashop/prestashop | all versions | 1.7.8.10 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for prestashop/prestashop. 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 prestashop/prestashop to 8.1.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-39527 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 CVE-2023-39527 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 CVE-2023-39527. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2023-39527 in your dependencies?
O3 detects CVE-2023-39527 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.