By injecting a cookie with certain special characters, an attacker on a shared subdomain which is not a secure context could set and thus overwrite cookies from a secure context, leading to session fixation and other attacks. This vulnerability affects Firefox ESR < 102.3, Thunderbird < 102.3, and Firefox < 105.
No PoCs from references.
- https://github.com/ARPSyndicate/cvemon
- https://github.com/Haxatron/browser-vulnerability-research