CVE-2026-18639

{"id": "CVE-2026-18639", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-18639", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-08-11T17:13:54.338948Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "cve@rapid7.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.3, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 2.1}]}, "affected": [{"source": "cve@rapid7.com", "affectedData": [{"repo": "https://github.com/Velocidex/velociraptor/", "vendor": "Rapid7", "product": "Velociraptor", "versions": [{"status": "affected", "version": "0", "lessThan": "0.77.2", "versionType": "semver"}], "defaultStatus": "unaffected"}]}], "published": "2026-08-11T16:17:30.590", "references": [{"url": "http://docs.velociraptor.app/announcements/advisories/cve-2026-18639/", "source": "cve@rapid7.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "cve@rapid7.com", "description": [{"lang": "en", "value": "CWE-290"}]}], "descriptions": [{"lang": "en", "value": "When Velociraptor is configured to use an OIDC IdP for authentication, it uses the email claim as a username. However, some IdP allow users to change the email claim without verification. Some IdPs do not set the \"email_verified\" claim and do not actually verify the email.\n\nThis allows a user to impersonate another user by setting their email address within the IdP, allowing account takeover."}], "lastModified": "2026-08-28T21:17:10.720", "sourceIdentifier": "cve@rapid7.com"}