What’s Vulnerable › Vulnerabilities

CVE-2023-37300

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-06-30 · updated 2026-06-17
• Weakness: CWE-863

Description

An issue was discovered in the CheckUserLog API in the CheckUser extension for MediaWiki through 1.39.3. There is incorrect access control for visibility of hidden users.

Affected products

• Wikimedia Foundation MediaWiki: through 1.39.3

References

• https://gerrit.wikimedia.org/r/q/I993fdcae1fedb7dd543b35a477026bc727615b0a
• https://phabricator.wikimedia.org/T330968
• https://gerrit.wikimedia.org/r/q/I993fdcae1fedb7dd543b35a477026bc727615b0a
• https://phabricator.wikimedia.org/T330968

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