CVE-2025-3469: i18n XSS vulnerability in HTMLMultiSelectField when sections are used

Severity: none (CVSS 0.0 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-04-10 · updated 2026-06-17
Weakness: CWE-79

Description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/htmlform/fields/HTMLMultiSelectField.Php. This issue affects MediaWiki: before 1.39.12, 1.42.6, 1.43.1.

Affected products

Wikimedia Foundation MediaWiki: before 1.39.12, 1.42.6, 1.43.1 — fixed in 1.42.6, 1.43.1, 1.39.12

How to fix

Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.42.6, 1.43.1, 1.39.12. Check the vendor advisory for mitigations.

References

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