{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-34086", "assignerOrgId": "c4f26cc8-17ff-4c99-b5e2-38fc1793eacc", "state": "PUBLISHED", "assignerShortName": "wikimedia-foundation", "dateReserved": "2026-03-25T17:15:46.521Z", "datePublished": "2026-05-11T14:35:15.143Z", "dateUpdated": "2026-05-11T17:33:27.011Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "c4f26cc8-17ff-4c99-b5e2-38fc1793eacc", "shortName": "wikimedia-foundation", "dateUpdated": "2026-05-11T14:35:15.143Z"}, "title": "AbuseFilter misuses ::userCanBitfield, exposing access-controlled information", "affected": [{"vendor": "Wikimedia Foundation", "product": "AbuseFilter", "repo": "https://gerrit.wikimedia.org/g/mediawiki/extensions/AbuseFilter/+/refs/heads/master", "versions": [{"status": "affected", "version": "*", "lessThan": "1.43.7, 1.44.4, 1.45.2", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "Vulnerability in Wikimedia Foundation AbuseFilter.\n\nThis issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Vulnerability in Wikimedia Foundation AbuseFilter.<p>This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.</p>"}]}], "references": [{"url": "https://phabricator.wikimedia.org/T415584"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "LOW", "subConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "subIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NEGLIGIBLE", "Automatable": "YES", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "LOW", "baseScore": 2.1, "vectorString": "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"}}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.2"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-20", "lang": "en", "description": "CWE-20 Improper Input Validation"}]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-11T17:33:23.386063Z", "id": "CVE-2026-34086", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-11T17:33:27.011Z"}}]}}