vBulletin 3.x.x and 4.2.x through 4.2.5 has an open redirect via the redirector.php url parameter.
https://cxsecurity.com/issue/WLB-2018010251
Source: Mitre, NVD
Published: 2018-01-25
Updated: 2026-06-17
Base Score: 5.8
Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N
Severity: Medium
Base Score: 6.1
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS: 0.09076