{"id":"CVE-2026-107147","aliases":[],"title":"Authentication bypass by spoofing in twofactor_gauthenticator","titleSource":"CERT-PL","descriptionSource":"CERT-PL","products":[{"vendor":"alexandregz","name":"twofactor_gauthenticator","platforms":[],"versions":[{"version":"0","status":"affected","lessThan":"4640889","versionType":"git"}],"defaultStatus":"unaffected","source":"CERT-PL","url":"https://www.cve.org/CVERecord?id=CVE-2026-107147"}],"remediation":[],"description":"The twofactor_gauthenticator plugin for Roundcube is vulnerable to 2fa authentication bypass by spoofed client address headers. Due to the lack of validation of the Client-IP and X-Forwarded-For headers, an attacker who obtains user's password can spoof a whitelisted IP address, resulting in the second factor being bypassed.\n\n\n\n\nThis issue was fixed in commit 4640889.","severity":"medium","score":6.3,"published":"2026-10-27T09:36:01.938Z","modified":"2026-10-27T09:36:01.938Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://cert.pl/en/posts/2026/10/CVE-2026-107145","https://github.com/alexandregz/twofactor_gauthenticator/blob/master/CHANGES-2FA-SECURITY.en.md"],"sources":[{"name":"CVE","id":"CVE-2026-107147","modified":"2026-10-27T09:36:01.938Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-107147"}],"assessments":[{"source":"CERT-PL","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","score":6.3}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T22:20:33.483Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}