MediaWiki before 1.23.15, 1.26.x before 1.26.4, and 1.27.x before 1.27.1 does not generate head items in the context of a given title, which allows remote attackers to obtain sensitive information via a parse action to api.php.
https://phabricator.wikimedia.org/T139570
https://phabricator.wikimedia.org/T139565
https://lists.wikimedia.org/pipermail/mediawiki-announce/2016-August/000195.html
https://bugzilla.redhat.com/show_bug.cgi?id=1369613
Source: Mitre, NVD
Published: 2017-04-20
Updated: 2025-04-20
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N
Severity: Medium
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Severity: High
EPSS: 0.00246