Enonic XP versions less than 7.7.4 are vulnerable to a session fixation issue. An remote and unauthenticated attacker can use prior sessions due to the lack of invalidating session attributes.
https://vulncheck.com/advisories/vc-advisory-GHSA-4m5p-5w5w-3jcf
https://github.com/enonic/xp/security/advisories/GHSA-4m5p-5w5w-3jcf
https://github.com/enonic/xp/issues/9253
https://github.com/enonic/xp/commit/2abac31cec8679074debc4f1fb69c25930e40842
https://github.com/enonic/xp/commit/1f44674eb9ab3fbab7103e8d08067846e88bace4
https://github.com/enonic/xp/commit/0189975691e9e6407a9fee87006f730e84f734ff