{"id":"CVE-2026-34090","aliases":["DEBIAN-CVE-2026-34090","EUVD-2026-29062","GHSA-cg3w-6fh3-65mw","UBUNTU-CVE-2026-34090"],"status":"published","title":"Suggested investigations: Handle suppressed usernames","description":"Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation CheckUser.\n\nThis issue affects CheckUser: from 1.45.0 before 1.45.2.","severity":{"version":"4.0","score":4.8,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.0028,"percentile":0.20683,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-200"],"published":"2026-04-03T09:00:12.521328Z","modified":"2026-10-26T18:10:00Z","products":[{"vendor":"mediawiki","product":"checkuser"},{"vendor":"wikimedia foundation","product":"checkuser"}],"references":[{"url":"https://phabricator.wikimedia.org/T411366","tags":["Issue Tracking","Patch","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34090"},{"url":"https://github.com/advisories/GHSA-cg3w-6fh3-65mw"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-34090","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-34090","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-34090","tags":["report"]},{"url":"https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/1240641","tags":["report"]},{"url":"https://lists.wikimedia.org/hyperkitty/list/wikitech-l@lists.wikimedia.org/thread/DIBLSBHISKX6NFRUFNOGZRVW42E7R2QP/","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-34090","title":"Suggested investigations: Handle suppressed usernames","description":"Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation CheckUser.\n\nThis issue affects CheckUser: from 1.45.0 before 1.45.2.","status":"published","published":"2026-05-11T14:50:50.318Z","modified":"2026-05-11T15:51:32.487Z","cvss":[{"version":"4.0","score":4.8,"vector":"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","level":"medium","assessor":"cna"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:20:14.302133Z"}],"euvd":[{"id":"EUVD-2026-29062","description":"Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation CheckUser.\n\nThis issue affects CheckUser: from 1.45.0 before 1.45.2.","status":"published","published":"2026-05-11T14:50:50Z","modified":"2026-05-11T15:51:32Z","cvss":[{"version":"4.0","score":4.8,"vector":"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","level":"medium"}],"updated_at":"2026-11-02T19:05:10.736891Z"}],"ghsa":[{"id":"GHSA-cg3w-6fh3-65mw","title":"Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation...","description":"Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation CheckUser.\n\nThis issue affects CheckUser: from 1.45.0 before 1.45.2.","status":"published","published":"2026-05-11T18:31:43Z","modified":"2026-05-14T18:33:53Z","cvss":[{"version":"4.0","score":4.8,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:U/V:X/RE:X/U:X","level":"medium"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T15:08:08.953643Z"}],"nvd":[{"id":"CVE-2026-34090","description":"Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation CheckUser.\n\nThis issue affects CheckUser: from 1.45.0 before 1.45.2.","status":"published","published":"2026-05-11T16:17:30.407Z","modified":"2026-10-26T18:10:00.173Z","cvss":[{"version":"4.0","score":4.8,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:U/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:12:18.239974Z"}],"osv":[{"id":"UBUNTU-CVE-2026-34090","description":"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.","status":"withdrawn","published":"2026-05-11T16:17:00Z","modified":"2026-05-26T07:30:15.2723188Z","cvss":[{"version":"4.0","score":4.8,"vector":"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","level":"medium"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T16:56:16.036833Z"},{"id":"DEBIAN-CVE-2026-34090","status":"withdrawn","published":"2026-04-03T09:00:12.521328Z","modified":"2026-04-03T13:01:45.082236Z","updated_at":"2026-11-02T15:45:54.587575Z"}]}}