{"id":"CVE-2026-127121","aliases":["DEBIAN-CVE-2026-127121","EUVD-2026-124529","GHSA-5qq6-8vww-hwx8"],"status":"published","title":"SOGo before 5.12.13 S/MIME Certificate Spoofing via UIxMailView","description":"SOGo before 5.12.13 contains an improper cryptographic signature verification vulnerability that allows remote attackers to replace a victim's contact S/MIME certificate by sending a spoofed multipart/signed message with a mismatched signature and an impersonated From address. Attackers can deliver a crafted CMS signedData object containing their own self-signed certificate, which SOGo's UIxMailView stores on the contact card without validating signature authenticity or certificate identity, enabling subsequent encrypted communications to be decrypted with the attacker's private key.","severity":{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-347"],"published":"2026-11-12T15:55:12Z","modified":"2026-11-13T02:45:56Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"sogo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.10.0-1","5.10.0-2","5.10.0-3","5.11.0-1","5.11.0-2","5.11.1-1","5.11.2-1","5.11.2-2","5.11.2-3","5.11.2-4","5.12.0-1","5.12.1-1","5.12.1-2","5.12.1-3","5.12.10-1","5.12.11-1","5.12.12-1","5.12.13-1","5.12.3-1","5.12.3-2","5.12.4-1","5.12.4-1.1","5.12.4-1.2","5.12.6-1","5.12.7-1","5.12.8-1","5.12.8-2","5.12.9-1","5.8.0-1","5.8.0-2+deb12u1","5.8.0-2+deb12u2","5.8.0-2+deb12u3","5.8.2-1","5.8.3-1","5.8.4-1","5.9.0-1","5.9.1-1"]},{"source":"osv","ecosystem":"Debian:13","package":"sogo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.12.1-3","5.12.1-3+deb13u1","5.12.1-3+deb13u2","5.12.1-3+deb13u3","5.12.10-1","5.12.11-1","5.12.12-1","5.12.13-1","5.12.3-1","5.12.3-2","5.12.4-1","5.12.4-1.1","5.12.4-1.2","5.12.6-1","5.12.7-1","5.12.8-1","5.12.8-2","5.12.9-1"]}],"products":[{"vendor":"alinto","product":"sogo"},{"vendor":"alinto sogo","product":"sogo"}],"references":[{"url":"https://github.com/Alinto/sogo/releases/tag/SOGo-5.12.13","tags":["patch","release-notes","fix"]},{"url":"https://www.vulncheck.com/advisories/sogo-before-s-mime-certificate-spoofing-via-uixmailview","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-127121","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-5qq6-8vww-hwx8"},{"url":"https://github.com/Alinto/sogo","tags":["package"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/127xxx/CVE-2026-127121.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-127121","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-127121","title":"SOGo before 5.12.13 S/MIME Certificate Spoofing via UIxMailView","description":"SOGo before 5.12.13 contains an improper cryptographic signature verification vulnerability that allows remote attackers to replace a victim's contact S/MIME certificate by sending a spoofed multipart/signed message with a mismatched signature and an impersonated From address. Attackers can deliver a crafted CMS signedData object containing their own self-signed certificate, which SOGo's UIxMailView stores on the contact card without validating signature authenticity or certificate identity, enabling subsequent encrypted communications to be decrypted with the attacker's private key.","status":"published","published":"2026-11-12T15:55:12.349Z","modified":"2026-11-12T17:17:31.603Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-347"],"updated_at":"2026-11-12T16:44:55.999858Z"}],"euvd":[{"id":"EUVD-2026-124529","description":"SOGo before 5.12.13 contains an improper cryptographic signature verification vulnerability that allows remote attackers to replace a victim's contact S/MIME certificate by sending a spoofed multipart/signed message with a mismatched signature and an impersonated From address. Attackers can deliver a crafted CMS signedData object containing their own self-signed certificate, which SOGo's UIxMailView stores on the contact card without validating signature authenticity or certificate identity, enabling subsequent encrypted communications to be decrypted with the attacker's private key.","status":"published","published":"2026-11-12T15:55:12Z","modified":"2026-11-12T17:17:31Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-12T20:34:58.221926Z"}],"ghsa":[{"id":"GHSA-5qq6-8vww-hwx8","title":"SOGo before 5.12.13 contains an improper cryptographic signature verification vulnerability that...","description":"SOGo before 5.12.13 contains an improper cryptographic signature verification vulnerability that allows remote attackers to replace a victim's contact S/MIME certificate by sending a spoofed multipart/signed message with a mismatched signature and an impersonated From address. Attackers can deliver a crafted CMS signedData object containing their own self-signed certificate, which SOGo's UIxMailView stores on the contact card without validating signature authenticity or certificate identity, enabling subsequent encrypted communications to be decrypted with the attacker's private key.","status":"published","published":"2026-11-12T18:31:47Z","modified":"2026-11-12T18:31:52Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/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":"high"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium"}],"cwes":["CWE-347"],"updated_at":"2026-11-12T18:42:37.941061Z"}],"nvd":[{"id":"CVE-2026-127121","description":"SOGo before 5.12.13 contains an improper cryptographic signature verification vulnerability that allows remote attackers to replace a victim's contact S/MIME certificate by sending a spoofed multipart/signed message with a mismatched signature and an impersonated From address. Attackers can deliver a crafted CMS signedData object containing their own self-signed certificate, which SOGo's UIxMailView stores on the contact card without validating signature authenticity or certificate identity, enabling subsequent encrypted communications to be decrypted with the attacker's private key.","status":"published","published":"2026-11-12T16:19:07.587Z","modified":"2026-11-12T18:17:41.6Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/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":"high","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-347"],"updated_at":"2026-11-12T19:32:19.690757Z"}],"osv":[{"id":"CVE-2026-127121","title":"SOGo before 5.12.13 S/MIME Certificate Spoofing via UIxMailView","description":"SOGo before 5.12.13 contains an improper cryptographic signature verification vulnerability that allows remote attackers to replace a victim's contact S/MIME certificate by sending a spoofed multipart/signed message with a mismatched signature and an impersonated From address. Attackers can deliver a crafted CMS signedData object containing their own self-signed certificate, which SOGo's UIxMailView stores on the contact card without validating signature authenticity or certificate identity, enabling subsequent encrypted communications to be decrypted with the attacker's private key.","status":"published","published":"2026-11-12T15:55:12.349Z","modified":"2026-11-13T02:45:56.954056403Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-347"],"updated_at":"2026-11-13T02:57:32.2543Z"},{"id":"DEBIAN-CVE-2026-127121","description":"SOGo before 5.12.13 contains an improper cryptographic signature verification vulnerability that allows remote attackers to replace a victim's contact S/MIME certificate by sending a spoofed multipart/signed message with a mismatched signature and an impersonated From address. Attackers can deliver a crafted CMS signedData object containing their own self-signed certificate, which SOGo's UIxMailView stores on the contact card without validating signature authenticity or certificate identity, enabling subsequent encrypted communications to be decrypted with the attacker's private key.","status":"published","published":"2026-11-12T16:19:07.587Z","modified":"2026-11-13T05:00:13.217476658Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/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":"high"}],"updated_at":"2026-11-13T05:30:21.188714Z"}]}}