{"id":"CVE-2026-58034","aliases":["EUVD-2026-41011","GHSA-5m8f-rxqc-4gpj"],"status":"published","title":"Stored XSS through a system message when blocking a temporary account that's related to other temporary accounts","description":"Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation CheckUser.\n\n This vulnerability is associated with program files modules/ext.CheckUser.TempAccounts/components/blockConnectedTempAccountsField.Vue.\n\n\n\nThis issue affects CheckUser: from 1.46.0-rc.0 before 1.46.0.","severity":{"version":"4.0","score":0,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N","level":"none","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00287,"percentile":0.21427,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-07-01T14:21:04Z","modified":"2026-10-27T02:31:02Z","products":[{"vendor":"mediawiki","product":"mediawiki"},{"vendor":"wikimedia foundation","product":"checkuser"}],"references":[{"url":"https://phabricator.wikimedia.org/T428820","tags":["Permissions Required","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58034"},{"url":"https://github.com/advisories/GHSA-5m8f-rxqc-4gpj"}],"sources":{"cve":[{"id":"CVE-2026-58034","title":"Stored XSS through a system message when blocking a temporary account that's related to other temporary accounts","description":"Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation CheckUser.\n\n This vulnerability is associated with program files modules/ext.CheckUser.TempAccounts/components/blockConnectedTempAccountsField.Vue.\n\n\n\nThis issue affects CheckUser: from 1.46.0-rc.0 before 1.46.0.","status":"published","published":"2026-07-01T14:21:04.398Z","modified":"2026-07-01T14:46:05.002Z","cvss":[{"version":"4.0","score":0,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N","level":"none","assessor":"cna"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T13:47:28.691429Z"}],"euvd":[{"id":"EUVD-2026-41011","description":"Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation CheckUser.\n\n This vulnerability is associated with program files modules/ext.CheckUser.TempAccounts/components/blockConnectedTempAccountsField.Vue.\n\n\n\nThis issue affects CheckUser: from 1.46.0-rc.0 before 1.46.0.","status":"published","published":"2026-07-01T14:21:04Z","modified":"2026-07-01T14:46:05Z","updated_at":"2026-11-02T18:20:19.829772Z"}],"ghsa":[{"id":"GHSA-5m8f-rxqc-4gpj","title":"Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')...","description":"Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation CheckUser.\n\n This vulnerability is associated with program files modules/ext.CheckUser.TempAccounts/components/blockConnectedTempAccountsField.Vue.\n\n\n\nThis issue affects CheckUser: from 1.46.0-rc.0 before 1.46.0.","status":"published","published":"2026-07-01T15:35:20Z","modified":"2026-07-09T18:32:30Z","cvss":[{"version":"4.0","score":0,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:N/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:X/V:X/RE:X/U:X","level":"none"},{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:09:22.189239Z"}],"nvd":[{"id":"CVE-2026-58034","description":"Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation CheckUser.\n\n This vulnerability is associated with program files modules/ext.CheckUser.TempAccounts/components/blockConnectedTempAccountsField.Vue.\n\n\n\nThis issue affects CheckUser: from 1.46.0-rc.0 before 1.46.0.","status":"published","published":"2026-07-01T15:17:11.15Z","modified":"2026-10-25T17:10:00.197Z","cvss":[{"version":"4.0","score":0,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:N/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:X/V:X/RE:X/U:X","level":"none","assessor":"secondary"},{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:27.199837Z"}],"osv":[{"id":"CVE-2026-58034","description":"Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation CheckUser.\n\n This vulnerability is associated with program files modules/ext.CheckUser.TempAccounts/components/blockConnectedTempAccountsField.Vue.\n\n\n\nThis issue affects CheckUser: from 1.46.0-rc.0 before 1.46.0.","status":"published","published":"2026-07-01T15:17:11.15Z","modified":"2026-10-27T02:31:02.748534026Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:12.016252Z"}]}}