What’s Vulnerable › Vulnerabilities

CVE-2019-12472

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-07-10 · updated 2026-06-17

Description

An Incorrect Access Control vulnerability was found in Wikimedia MediaWiki 1.18.0 through 1.32.1. It is possible to bypass the limits on IP range blocks ($wgBlockCIDRLimit) by using the API. Fixed in 1.32.2, 1.31.2, 1.30.2 and 1.27.6.

Affected products

• Wikimedia Foundation MediaWiki: from 1.18.0 before 1.27.6; from 1.30.0 before 1.30.2; from 1.31.0 before 1.31.2; from 1.32.0 before 1.32.2 — fixed in 1.27.6, 1.30.2, 1.31.2, 1.32.2

How to fix

Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.27.6, 1.30.2, 1.31.2, 1.32.2. Check the vendor advisory for mitigations.

References

• https://lists.wikimedia.org/pipermail/wikitech-l/2019-June/092152.html
• https://phabricator.wikimedia.org/T199540
• https://lists.wikimedia.org/pipermail/wikitech-l/2019-June/092152.html
• https://phabricator.wikimedia.org/T199540

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