CVE-2022-34911

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-07-02 · updated 2026-06-17
Weakness: CWE-79

Description

An issue was discovered in MediaWiki before 1.35.7, 1.36.x and 1.37.x before 1.37.3, and 1.38.x before 1.38.1. XSS can occur in configurations that allow a JavaScript payload in a username. After account creation, when it sets the page title to "Welcome" followed by the username, the username is not escaped: SpecialCreateAccount::successfulAction() calls ::showSuccessPage() with a message as second parameter, and OutputPage::setPageTitle() uses text().

Affected products

Fedoraproject Fedora: 36, 37
Wikimedia Foundation MediaWiki: before 1.35.7; from 1.36.0 before 1.37.3; 1.38.0, 1.38.0-rc0, 1.38.0-rc1 — fixed in 1.35.7, 1.37.3

How to fix

Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.35.7, 1.37.3. Check the vendor advisory for mitigations.

References

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