A session fixation vulnerability exists in Jenkins 2.145 and earlier, LTS 2.138.1 and earlier in core/src/main/java/hudson/security/HudsonPrivateSecurityRealm.java that prevented Jenkins from invalidating the existing session and creating a new one when a user signed up for a new user account.
{
"versions": [
{
"introduced": "0"
},
{
"last_affected": "2.138.1"
},
{
"introduced": "0"
},
{
"last_affected": "2.145"
}
]
}