Impact Missing validation on Express Checkout feature allows silent log-in

Affected versions

The issue was introduced in PrestaShop Checkout 1.3.0 .

All versions above 1.3.0 are vulnerable except of course the patch versions published on 16/10/2025: 7.4.4.1, 8.4.4.1, 7.5.0.5, 8.5.0.5, 9.5.0.5

Patches The problem has been patched in versions

- v4.4.1 for PrestaShop 1.7 (build number: 7.4.4.1) - v4.4.1 for PrestaShop 8 (build number: 8.4.4.1) - v5.0.5 for PrestaShop 1.7 (build number: 7.5.0.5) - v5.0.5 for PrestaShop 8 (build number: 8.5.0.5) - v5.0.5 for PrestaShop 9 (build number: 9.5.0.5)

Read our Versioning policy to learn more about our build numbers and versions of PrestaShop Checkout

Credits We would like to thank Léo CUNÉAZ for reporting the issue.