What’s Vulnerable › Vulnerabilities

CVE-2026-103446: WikiLambda exposes anonymous execution of unsaved Abstract Wikipedia fragments

• Severity: high (CVSS 7.4 v4.0)
• 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: 2026-09-30 · updated 2026-10-06
• Weakness: CWE-639

Description

Authorization bypass through User-Controlled key vulnerability in The Wikimedia Foundation MediaWiki WikiLambda extension allows Authentication Bypass. This issue affects MediaWiki WikiLambda extension: 1.46.

Affected products

• The Wikimedia Foundation MediaWiki WikiLambda extension: 1.46

References

• https://gerrit.wikimedia.org/r/q/If2c05b109672fc65f63372f86c768859dc6639fd
• https://phabricator.wikimedia.org/T435086

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