flask: Possible disclosure of permanent session cookie due to missing Vary: Cookie header

A flaw was found in the Python Flask package. A cached response may contain data for one client sent by a proxy to other clients, including session cookies, resulting in the compromise of data confidentiality contained in the leak requests or cookies. This happens when the following conditions ar...

DEBIAN-CVE-2019-17673

WordPress before 5.2.4 is vulnerable to poisoning of the cache of JSON GET requests because certain requests lack a Vary: Origin header...

resteasy: Vary header not added by CORS filter leading to cache poisoning

It was discovered that the CORS Filter did not add an HTTP Vary header indicating that the response varies depending on Origin. This permitted client and server side cache poisoning in some circumstances...