What’s Vulnerable › Vulnerabilities

CVE-2026-58035: Stored XSS through a system message in the codex version of Special:Block

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-01 · updated 2026-10-25
• 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 resources/src/mediawiki.Special.Block/SpecialBlock.Vue.

Affected products

• Wikimedia Foundation MediaWiki: 1.46.0-rc0

References

• https://phabricator.wikimedia.org/T428809

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