What’s Vulnerable › Vulnerabilities

CVE-2019-16738

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-09-26 · updated 2026-06-17
• Weakness: CWE-862

Description

In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup.

Affected products

• Debian Linux: 9.0, 10.0
• Fedoraproject Fedora: 30, 31
• Wikimedia Foundation MediaWiki: from 1.31.0 before 1.31.4; from 1.32.0 before 1.32.4; from 1.33.0 before 1.33.1 — fixed in 1.31.4, 1.32.4, 1.33.1

How to fix

Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.31.4, 1.32.4, 1.33.1. Check the vendor advisory for mitigations.

References

• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7OMG3BMUHGWTAPYTK2NXM6CXF6FYLOUO/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QBAOLXETM5BOYQG6OQVHGB2LNLZUXVN6/
• https://phabricator.wikimedia.org/T230402
• https://seclists.org/bugtraq/2019/Oct/32
• https://www.debian.org/security/2019/dsa-4545
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7OMG3BMUHGWTAPYTK2NXM6CXF6FYLOUO/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QBAOLXETM5BOYQG6OQVHGB2LNLZUXVN6/
• https://phabricator.wikimedia.org/T230402
• https://seclists.org/bugtraq/2019/Oct/32
• https://www.debian.org/security/2019/dsa-4545

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