PatchTheCVEcheckuser vulnerabilities and fixes
Recent CVEs affecting checkuser, with upgrade or downgrade steps. 1 tracked.
checkuser has 1 tracked vulnerability, 0 critical. A fixed release or vendor patch exists for 1. Most recent: 2026-05-11. Highest priority: CVE-2026-34090 (score 36/100).
- CVE-2026-34090 HIGH 7.5 UPGRADE Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation CheckUser. T
FAQ
How do I fix checkuser vulnerabilities?
Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.
Is checkuser being exploited right now?
None of the tracked checkuser CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.
Which checkuser CVE should I patch first?
CVE-2026-34090 currently ranks highest (36/100): Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation CheckUser. T.