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.

Impact Missing validation on input vulnerable to directory traversal.

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 the Versioning policy to learn more about the build number.

Credits Léo CUNÉAZ for reportied this issue.

Impact Wrong usage of the PHP arraysearch() allows bypass of validation.

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 the Versioning policy to learn more about the build number.

Credits Léo CUNÉAZ reported this issue.