Before WordPress 4.9.5, the URL validator assumed URLs with the hostname localhost were on the same host as the WordPress server.
https://www.debian.org/security/2018/dsa-4193
https://wpvulndb.com/vulnerabilities/9053
https://github.com/WordPress/WordPress/commit/804363859602d4050d9a38a21f5a65d9aec18216
http://www.securitytracker.com/id/1040836
http://www.securityfocus.com/bid/104350
https://wordpress.org/news/2018/04/wordpress-4-9-5-security-and-maintenance-release/
https://core.trac.wordpress.org/changeset/42894
https://codex.wordpress.org/Version_4.9.5
Source: Mitre, NVD
Published: 2018-04-16
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: 0.08454