{"id":"CVE-2026-74864","aliases":["EUVD-2026-89796","GHSA-fxx9-8vhm-fwhc"],"status":"published","title":"Authentication Bypass in sogo_yhn","description":"sogo_yhn configures SOGo with a parameter that forces the request with HTTP header \"x-webobjects-remote-user\" to be treated as sent by a verified user without performing password validation. Since Nginx does not strip this header, any client can supply it arbitrarily and gain access as any user, including a privileged user, without providing a password.\n\n\n\n\nThis issue was fixed in version 5.8.0~ynh9.","severity":{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00406,"percentile":0.3525,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-639"],"published":"2026-09-30T12:02:29Z","modified":"2026-09-30T19:57:08Z","products":[{"vendor":"yunohost-apps","product":"sogo_yhn"}],"references":[{"url":"https://cert.pl/en/posts/2026/09/CVE-2026-74864","tags":["third-party-advisory"]},{"url":"https://forum.yunohost.org/t/sogo-critical-vulnerability-fixed-in-5-8-0-ynh9/42699","tags":["issue-tracking"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74864"},{"url":"https://github.com/advisories/GHSA-fxx9-8vhm-fwhc"}],"sources":{"cve":[{"id":"CVE-2026-74864","title":"Authentication Bypass in sogo_yhn","description":"sogo_yhn configures SOGo with a parameter that forces the request with HTTP header \"x-webobjects-remote-user\" to be treated as sent by a verified user without performing password validation. Since Nginx does not strip this header, any client can supply it arbitrarily and gain access as any user, including a privileged user, without providing a password.\n\n\n\n\nThis issue was fixed in version 5.8.0~ynh9.","status":"published","published":"2026-09-30T12:02:29.34Z","modified":"2026-09-30T12:50:52.363Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical","assessor":"cna"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T14:20:03.081354Z"}],"euvd":[{"id":"EUVD-2026-89796","description":"sogo_yhn configures SOGo with a parameter that forces the request with HTTP header \"x-webobjects-remote-user\" to be treated as sent by a verified user without performing password validation. Since Nginx does not strip this header, any client can supply it arbitrarily and gain access as any user, including a privileged user, without providing a password.\n\n\n\n\nThis issue was fixed in version 5.8.0~ynh9.","status":"published","published":"2026-09-30T12:02:29Z","modified":"2026-09-30T12:50:52Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical"}],"updated_at":"2026-11-02T17:27:50.183381Z"}],"ghsa":[{"id":"GHSA-fxx9-8vhm-fwhc","title":"sogo_yhn configures SOGo with a parameter that forces the request with HTTP header \"x-webobjects...","description":"sogo_yhn configures SOGo with a parameter that forces the request with HTTP header \"x-webobjects-remote-user\" to be treated as sent by a verified user without performing password validation. Since Nginx does not strip this header, any client can supply it arbitrarily and gain access as any user, including a privileged user, without providing a password.\n\n\n\n\nThis issue was fixed in version 5.8.0~ynh9.","status":"published","published":"2026-09-30T15:31:25Z","modified":"2026-09-30T15:31:32Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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":"critical"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T15:12:36.462442Z"}],"nvd":[{"id":"CVE-2026-74864","description":"sogo_yhn configures SOGo with a parameter that forces the request with HTTP header \"x-webobjects-remote-user\" to be treated as sent by a verified user without performing password validation. Since Nginx does not strip this header, any client can supply it arbitrarily and gain access as any user, including a privileged user, without providing a password.\n\n\n\n\nThis issue was fixed in version 5.8.0~ynh9.","status":"published","published":"2026-09-30T13:17:19.913Z","modified":"2026-09-30T19:57:08.043Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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":"critical","assessor":"secondary"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T14:12:52.759595Z"}]}}