MediaWiki Checkuser
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By the Year
In 2026 there have been 1 vulnerability in MediaWiki Checkuser with an average score of 3.1 out of ten. Checkuser did not have any published security vulnerabilities last year. That is, 1 more vulnerability have already been reported in 2026 as compared to last year.
| Year | Vulnerabilities | Average Score |
|---|---|---|
| 2026 | 1 | 3.10 |
| 2025 | 0 | 0.00 |
| 2024 | 0 | 0.00 |
| 2023 | 0 | 0.00 |
| 2022 | 0 | 0.00 |
| 2021 | 0 | 0.00 |
| 2020 | 1 | 5.30 |
| 2019 | 1 | 0.00 |
It may take a day or so for new Checkuser vulnerabilities to show up in the stats or in the list of recent security vulnerabilities. Additionally vulnerabilities may be tagged under a different product or component name.
Recent MediaWiki Checkuser Security Vulnerabilities
MediaWiki CheckUser 1.39.3: Hidden Usernames Leak (CVE-2023-37252)
CVE-2023-37252
3.1 - Low
- September 14, 2026
An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. Special:CheckUserLog shows usernames that have been hidden.
Incorrect Resource Transfer Between Spheres
An issue was discovered in the CheckUser extension through 1.35.0 for MediaWiki
CVE-2019-16529
5.3 - Medium
- March 19, 2020
An issue was discovered in the CheckUser extension through 1.35.0 for MediaWiki. Oversighted edit summaries are still visible in CheckUser results in violation of MediaWiki's permissions model.
An issue was discovered in the CheckUser extension through 1.34 for MediaWiki
CVE-2019-18611
- October 29, 2019
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.
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