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CVE-2020-25828

MediaWiki Cross-site Scripting (XSS) vulnerability

Impact

An issue was discovered in MediaWiki before 1.31.9 and 1.32.x through 1.34.x before 1.34.3. The non-jqueryMsg version of mw.message().parse() doesn't escape HTML. This affects both message contents (which are generally safe) and the parameters (which can be based on user input). (When jqueryMsg is loaded, it correctly accepts only whitelisted tags in message contents, and escapes all parameters. Situations with an unloaded jqueryMsg are rare in practice, but can for example occur for Special:SpecialPages on a wiki with no extensions installed.)

Affected packages

EcosystemPackageAffectedFixed in
composermediawiki/core>= 1.31.0, < 1.31.91.31.9

Affected products

VendorProductAffected versions
MediawikiMediawiki
from 1.32.0 before 1.34.4
Version 1.31.10
FedoraprojectFedora
Version 33

Weakness classification

CWE-79

References