{"id":"CVE-2026-34086","aliases":["DEBIAN-CVE-2026-34086","EUVD-2026-29058","GHSA-5qc5-wp75-wxgx","UBUNTU-CVE-2026-34086"],"status":"published","title":"AbuseFilter misuses ::userCanBitfield, exposing access-controlled information","description":"Vulnerability in Wikimedia Foundation AbuseFilter.\n\nThis issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.","severity":{"version":"4.0","score":2.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/S:N/AU:Y","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00244,"percentile":0.15706,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2026-05-11T14:35:15Z","modified":"2026-10-27T10:01:00Z","fixes":[{"ecosystem":"Debian:13","package":"mediawiki","fixed_in":["1:1.43.8+dfsg-1~deb13u1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"mediawiki","fixed_in":["1:1.43.8+dfsg-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.39.10-1","1:1.39.10-1~deb12u1","1:1.39.12-1~deb12u1","1:1.39.13-1~deb12u1","1:1.39.17-1+deb12u2","1:1.39.17-1~deb12u1","1:1.39.2-1","1:1.39.4-1","1:1.39.4-1~deb12u1","1:1.39.4-2","1:1.39.5-1","1:1.39.5-1~deb12u1","1:1.39.6-1","1:1.39.7-1","1:1.39.7-1~deb12u1","1:1.39.8-1","1:1.43.0+dfsg-1","1:1.43.0+dfsg-2","1:1.43.1+dfsg-1","1:1.43.1+dfsg-2","1:1.43.10+dfsg-1","1:1.43.11+dfsg-1","1:1.43.11+dfsg-2","1:1.43.11+dfsg-3","1:1.43.3+dfsg-1","1:1.43.5+dfsg-1","1:1.43.6+dfsg-1","1:1.43.6+dfsg-1~deb13u1","1:1.43.6+dfsg-2","1:1.43.8+dfsg-1","1:1.43.8+dfsg-1~deb13u1","1:1.43.8+dfsg-2","1:1.43.9+dfsg-1","1:1.43.9+dfsg-1~deb13u1"]},{"source":"osv","ecosystem":"Debian:13","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.43.8+dfsg-1~deb13u1"}]}],"versions":["1:1.43.3+dfsg-1","1:1.43.5+dfsg-1","1:1.43.6+dfsg-1","1:1.43.6+dfsg-1~deb13u1","1:1.43.6+dfsg-2"]},{"source":"osv","ecosystem":"Debian:14","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.43.8+dfsg-1"}]}],"versions":["1:1.43.3+dfsg-1","1:1.43.5+dfsg-1","1:1.43.6+dfsg-1","1:1.43.6+dfsg-1~deb13u1","1:1.43.6+dfsg-2","1:1.43.8+dfsg-1~deb13u1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.27.3-1","1:1.27.4-1","1:1.27.4-2","1:1.27.4-3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.31.2-1ubuntu1","1:1.31.5-1","1:1.31.5-1ubuntu1","1:1.31.5-2","1:1.31.5-3","1:1.31.5-3ubuntu1","1:1.31.6-1","1:1.31.7-1","1:1.31.7-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.35.3-1","1:1.35.4-1","1:1.35.5-1","1:1.35.5-1ubuntu1","1:1.35.5-1ubuntu2","1:1.35.5-1ubuntu3","1:1.35.6-1","1:1.35.6-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.39.4-2","1:1.39.5-1","1:1.39.6-1","1:1.39.7-1","1:1.39.7-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.43.1+dfsg-1","1:1.43.1+dfsg-2","1:1.43.3+dfsg-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.43.8+dfsg-2","1:1.43.9+dfsg-1","1:1.43.9+dfsg-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.43.3+dfsg-1","1:1.43.5+dfsg-1","1:1.43.6+dfsg-2","1:1.43.8+dfsg-1","1:1.43.8+dfsg-2"]}],"products":[{"vendor":"wikimedia foundation","product":"abusefilter"}],"references":[{"url":"https://phabricator.wikimedia.org/T415584"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34086"},{"url":"https://github.com/advisories/GHSA-5qc5-wp75-wxgx"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-34086","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-34086","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-34086","tags":["report"]},{"url":"http://phabricator.wikimedia.org/T415584","tags":["report"]},{"url":"https://gerrit.wikimedia.org/r/c/mediawiki/extensions/AbuseFilter/+/1265634","tags":["report"]},{"url":"https://gerrit.wikimedia.org/r/c/mediawiki/extensions/AbuseFilter/+/1265611","tags":["report"]},{"url":"https://lists.wikimedia.org/hyperkitty/list/wikitech-l@lists.wikimedia.org/thread/DIBLSBHISKX6NFRUFNOGZRVW42E7R2QP/","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-34086","title":"AbuseFilter misuses ::userCanBitfield, exposing access-controlled information","description":"Vulnerability in Wikimedia Foundation AbuseFilter.\n\nThis issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.","status":"published","published":"2026-05-11T14:35:15.143Z","modified":"2026-05-11T17:33:27.011Z","cvss":[{"version":"4.0","score":2.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/S:N/AU:Y","level":"low","assessor":"cna"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:20:14.665567Z"}],"euvd":[{"id":"EUVD-2026-29058","description":"Vulnerability in Wikimedia Foundation AbuseFilter.\n\nThis issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.","status":"published","published":"2026-05-11T14:35:15Z","modified":"2026-05-11T17:33:27Z","cvss":[{"version":"4.0","score":2.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/S:N/AU:Y","level":"low"}],"updated_at":"2026-11-02T19:05:10.736891Z"}],"ghsa":[{"id":"GHSA-5qc5-wp75-wxgx","title":"Vulnerability in Wikimedia Foundation AbuseFilter.\n\nThis issue affects AbuseFilter: from * before...","description":"Vulnerability in Wikimedia Foundation AbuseFilter.\n\nThis issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.","status":"published","published":"2026-05-11T18:31:43Z","modified":"2026-05-11T18:31:54Z","cvss":[{"version":"4.0","score":2.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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:N/AU:Y/R:X/V:X/RE:X/U:X","level":"low"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:07:59.393178Z"}],"nvd":[{"id":"CVE-2026-34086","description":"Vulnerability in Wikimedia Foundation AbuseFilter.\n\nThis issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.","status":"published","published":"2026-05-11T16:17:29.857Z","modified":"2026-10-26T18:10:00.173Z","cvss":[{"version":"4.0","score":2.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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:N/AU:Y/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:12:18.239974Z"}],"osv":[{"id":"DEBIAN-CVE-2026-34086","description":"Vulnerability in Wikimedia Foundation AbuseFilter.  This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.","status":"published","published":"2026-05-11T16:17:29.857Z","modified":"2026-10-27T10:01:00.089410792Z","cvss":[{"version":"4.0","score":2.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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:N/AU:Y/R:X/V:X/RE:X/U:X","level":"low"}],"updated_at":"2026-11-02T15:45:54.587575Z"},{"id":"UBUNTU-CVE-2026-34086","description":"Vulnerability in Wikimedia Foundation AbuseFilter. This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.","status":"published","published":"2026-05-11T16:17:00Z","modified":"2026-10-17T12:58:11.547013804Z","cvss":[{"version":"4.0","score":2.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/S:N/AU:Y","level":"low"}],"updated_at":"2026-11-02T16:56:16.036833Z"}]}}