Mediawiki before 1.28.1 / 1.27.2 / 1.23.16 has a flaw where Special:UserLogin?returnto=interwiki:foo will redirect to external sites.
https://security-tracker.debian.org/tracker/CVE-2017-0363
https://phabricator.wikimedia.org/T109140
https://lists.wikimedia.org/pipermail/mediawiki-announce/2017-April/000207.html
Source: Mitre, NVD
Published: 2018-04-13
Updated: 2024-11-21
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: 0.00184