Description
An issue was discovered in MediaWiki through 1.38.1. The lemma length of a Wikibase lexeme is currently capped at a thousand characters. Unfortunately, this length is not validated, allowing much larger lexemes to be created, which introduces various denial-of-service attack vectors within the Wikibase and WikibaseLexeme extensions. This is related to Special:NewLexeme and Special:NewProperty.
Remediation
References
Related Vulnerabilities
Piwigo Cross-Site Request Forgery (CSRF) Vulnerability (CVE-2017-10681)
MySQL CVE-2020-2923 Vulnerability (CVE-2020-2923)
Oracle Database Server CVE-2019-2517 Vulnerability (CVE-2019-2517)
WordPress Plugin BuddyPress Security Bypass (5.1.0)
Joomla! Core 3.x.x Multiple Cross-Site Request Forgery Vulnerabilities (3.0.0 - 3.9.14)