{"id":"CVE-2026-107147","aliases":["EUVD-2026-110649","GHSA-f37x-h4hh-7q49","UBUNTU-CVE-2026-107147"],"status":"published","title":"Authentication bypass by spoofing in twofactor_gauthenticator","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":{"version":"4.0","score":6.3,"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00392,"percentile":0.33703,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-290"],"published":"2026-10-27T09:36:01Z","modified":"2026-11-04T14:58:11Z","affected":[{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"roundcube","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.1+dfsg.1-2","1.1.2+dfsg.1-5","1.1.3+dfsg.1-1","1.1.4+dfsg.1-1","1.2~beta+dfsg.1-0ubuntu1","1.2~beta+dfsg.1-0ubuntu1+esm1","1.2~beta+dfsg.1-0ubuntu1+esm2","1.2~beta+dfsg.1-0ubuntu1+esm3","1.2~beta+dfsg.1-0ubuntu1+esm4","1.2~beta+dfsg.1-0ubuntu1+esm5","1.2~beta+dfsg.1-0ubuntu1+esm6","1.2~beta+dfsg.1-0ubuntu1+esm7","1.2~beta+dfsg.1-0ubuntu1+esm8"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"roundcube","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.0+dfsg.1-1","1.3.1+dfsg.1-1","1.3.3+dfsg.1-1","1.3.3+dfsg.1-2","1.3.6+dfsg.1-1","1.3.6+dfsg.1-1ubuntu0.1~esm1","1.3.6+dfsg.1-1ubuntu0.1~esm2","1.3.6+dfsg.1-1ubuntu0.1~esm3","1.3.6+dfsg.1-1ubuntu0.1~esm4","1.3.6+dfsg.1-1ubuntu0.1~esm5","1.3.6+dfsg.1-1ubuntu0.1~esm6","1.3.6+dfsg.1-1ubuntu0.1~esm7","1.3.6+dfsg.1-1ubuntu0.1~esm8"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"roundcube","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.8+dfsg.1-2","1.3.10+dfsg.1-1","1.4.1+dfsg.1-2","1.4.2+dfsg.1-1","1.4.2+dfsg.1-2","1.4.3+dfsg.1-1","1.4.3+dfsg.1-1ubuntu0.1~esm1","1.4.3+dfsg.1-1ubuntu0.1~esm2","1.4.3+dfsg.1-1ubuntu0.1~esm3","1.4.3+dfsg.1-1ubuntu0.1~esm4","1.4.3+dfsg.1-1ubuntu0.1~esm5","1.4.3+dfsg.1-1ubuntu0.1~esm6","1.4.3+dfsg.1-1ubuntu0.1~esm7","1.4.3+dfsg.1-1ubuntu0.1~esm8"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"roundcube","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.11+dfsg.1-4","1.5.0+dfsg.1-2","1.5.0+dfsg.1-2ubuntu0.1~esm1","1.5.0+dfsg.1-2ubuntu0.1~esm2","1.5.0+dfsg.1-2ubuntu0.1~esm3","1.5.0+dfsg.1-2ubuntu0.1~esm4","1.5.0+dfsg.1-2ubuntu0.1~esm5","1.5.0+dfsg.1-2ubuntu0.1~esm6"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"roundcube","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.2+dfsg-1","1.6.4+dfsg-1","1.6.5+dfsg-1","1.6.6+dfsg-1","1.6.6+dfsg-2","1.6.6+dfsg-2ubuntu0.1","1.6.6+dfsg-2ubuntu0.1+esm1","1.6.6+dfsg-2ubuntu0.1+esm2","1.6.6+dfsg-2ubuntu0.1+esm3"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"roundcube","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.11+dfsg-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:26.04:LTS","package":"roundcube","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.11+dfsg-1","1.6.11+dfsg-1ubuntu0.26.04.1~esm1"]}],"products":[{"vendor":"alexandregz","product":"twofactor_gauthenticator"}],"references":[{"url":"https://cert.pl/en/posts/2026/10/CVE-2026-107145","tags":["third-party-advisory","advisory","report"]},{"url":"https://github.com/alexandregz/twofactor_gauthenticator/blob/master/CHANGES-2FA-SECURITY.en.md","tags":["patch","fix","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-107147","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-f37x-h4hh-7q49"},{"url":"https://github.com","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107147.json","tags":["advisory"]},{"url":"https://github.com/alexandregz/twofactor_gauthenticator","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-107147","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-107147","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-107147","title":"Authentication bypass by spoofing in twofactor_gauthenticator","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.","status":"published","published":"2026-10-27T09:36:01.938Z","modified":"2026-11-04T14:58:11.19Z","cvss":[{"version":"4.0","score":6.3,"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","level":"medium","assessor":"cna"}],"cwes":["CWE-290"],"updated_at":"2026-11-04T15:32:52.167772Z"}],"euvd":[{"id":"EUVD-2026-110649","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.","status":"published","published":"2026-10-27T09:36:01Z","modified":"2026-11-04T14:58:11Z","cvss":[{"version":"4.0","score":6.3,"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","level":"medium"}],"updated_at":"2026-11-04T16:10:36.502596Z"}],"ghsa":[{"id":"GHSA-f37x-h4hh-7q49","title":"The twofactor_gauthenticator plugin for Roundcube is vulnerable to 2fa authentication bypass by...","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.","status":"published","published":"2026-10-27T12:30:44Z","modified":"2026-10-27T12:30:45Z","cvss":[{"version":"4.0","score":6.3,"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/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":"medium"}],"cwes":["CWE-290"],"updated_at":"2026-11-02T15:14:28.758422Z"}],"nvd":[{"id":"CVE-2026-107147","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.","status":"published","published":"2026-10-27T10:16:54.29Z","modified":"2026-11-04T15:17:25.83Z","cvss":[{"version":"4.0","score":6.3,"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/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":"medium","assessor":"secondary"}],"cwes":["CWE-290"],"updated_at":"2026-11-04T18:06:23.753671Z"}],"osv":[{"id":"CVE-2026-107147","title":"Authentication bypass by spoofing in twofactor_gauthenticator","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.","status":"published","published":"2026-10-27T09:36:01.938Z","modified":"2026-11-05T21:15:50.409809374Z","cvss":[{"version":"4.0","score":6.3,"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","level":"medium"}],"cwes":["CWE-290"],"updated_at":"2026-11-05T22:01:21.792402Z"},{"id":"UBUNTU-CVE-2026-107147","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. This issue was fixed in commit 4640889.","status":"published","published":"2026-10-27T10:16:00Z","modified":"2026-10-28T20:17:40.873924404Z","cvss":[{"version":"4.0","score":6.3,"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","level":"medium"}],"updated_at":"2026-11-02T16:55:59.130573Z"}]}}