CVE Explorer
CVE-2026-34090
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation CheckUser.
This issue affects CheckUser: from 1.45.0 before 1.45.2.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"CheckUser","repo":"https://gerrit.wikimedia.org/g/mediawiki/extensions/CheckUser/+/refs/heads/master","vendor":"Wikimedia Foundation","versions":[{"lessThan":"1.45.2","status":"affected","version":"1.45.0","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:f8e8f120e13b371cacfb9681aeb5a305533ed7b7eedc2a182effaf2f3ae9dbeb · sha256:8c39c463d01be711… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"Automatable":"NOT_DEFINED","Recovery":"USER","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":4.8,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"HIGH","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/R:U","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact"…
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:f8e8f120e13b371cacfb9681aeb5a305533ed7b7eedc2a182effaf2f3ae9dbeb · sha256:8c39c463d01be711… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-200","description":"CWE-200 Exposure of Sensitive Information to an Unauthorized Actor","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:f8e8f120e13b371cacfb9681aeb5a305533ed7b7eedc2a182effaf2f3ae9dbeb · sha256:8c39c463d01be711… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"url":"https://phabricator.wikimedia.org/T411366"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:f8e8f120e13b371cacfb9681aeb5a305533ed7b7eedc2a182effaf2f3ae9dbeb · sha256:8c39c463d01be711… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.