Description
includes/upload/UploadBase.php in MediaWiki before 1.19.12, 1.20.x and 1.21.x before 1.21.6, and 1.22.x before 1.22.3 does not prevent use of invalid namespaces in SVG files, which allows remote attackers to conduct cross-site scripting (XSS) attacks via an SVG upload, as demonstrated by use of a W3C XHTML namespace in conjunction with an IFRAME element.
Remediation
References
Related Vulnerabilities
WordPress 4.8.x Directory Traversal (4.8 - 4.8.24)
MediaWiki Improper Restriction of Excessive Authentication Attempts Vulnerability (CVE-2020-25827)
MySQL CVE-2012-3144 Vulnerability (CVE-2012-3144)
Citrix ADC NetScaler Local File Inclusion (CVE-2020-8193)
WordPress Plugin Social Connect Cross-Site Scripting (1.0.4)