Mediawiki 1.31 before 1.31.1, 1.30.1, 1.29.3 and 1.27.5 contains a flaw where contrary to the documentation, $wgRateLimits entry for 'user' overrides that for 'newbie'.
http://www.securitytracker.com/id/1041695
https://access.redhat.com/errata/RHSA-2019:3142
https://access.redhat.com/errata/RHSA-2019:3238
https://lists.wikimedia.org/pipermail/wikitech-l/2018-September/090849.html
Source: MITRE
Published: 2018-10-04
Updated: 2019-10-18
Type: CWE-269
Base Score: 4
Vector: AV:N/AC:L/Au:S/C:N/I:P/A:N
Impact Score: 2.9
Exploitability Score: 8
Severity: MEDIUM
Base Score: 4.3
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Impact Score: 1.4
Exploitability Score: 2.8
Severity: MEDIUM