What’s Vulnerable › Vulnerabilities

CVE-2019-18611

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-10-29 · updated 2026-06-17
• Weakness: CWE-200

Description

An issue was discovered in the CheckUser extension through 1.34 for MediaWiki. Certain sensitive information within oversighted edit summaries made available via the MediaWiki API was potentially visible to users with various levels of access to this extension. Said users should not have been able to view these oversighted edit summaries via the MediaWiki API.

Affected products

• Wikimedia Foundation CheckUser: through 1.34

References

• https://gerrit.wikimedia.org/r/q/Ie0aa0df2b3f03d8b910733f1b5e600a0dc978765
• https://phabricator.wikimedia.org/T234862
• https://gerrit.wikimedia.org/r/q/Ie0aa0df2b3f03d8b910733f1b5e600a0dc978765
• https://phabricator.wikimedia.org/T234862

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