nopCommerce v4.70 and prior, and version 4.80.3, does not invalidate session cookies after logout or session termination, allowing an attacker who has a
a valid session cookie access to privileged endpoints (such as /admin) even after the legitimate user has logged out, enabling session hijacking. Any version above 4.70 that is not 4.80.3 fixes the vulnerability.
In nopCommerce 4.50.1, an open redirect vulnerability can be triggered by luring a user to authenticate to a nopCommerce page by clicking on a crafted link.
Libraries/Nop.Services/Localization/LocalizationService.cs in nopCommerce through 4.10 allows XXE via the "Configurations -> Languages -> Edit Language -> Import Resources -> Upload XML file" screen.