Cross-origin resource sharing: unencrypted origin trusted
Summary: PortSwigger describes a CORS misconfiguration in which a site's cross-origin resource sharing policy trusts an origin that uses unencrypted HTTP. Because an attacker positioned to view and modify a user's unencrypted traffic can control responses from that origin, the application effectively extends trust to those attackers and undoes much of the benefit of HTTPS.
Why it matters: The flaw is rated Low (0x00200602), but it hands anyone who can sit on the network path the ability to inject content that interacts with the application - a stake worth weighing against the assumption that HTTPS on your own domain closes that door.
Read the original at PortSwigger Research ↗
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