{"id":"EM-20261110-D4MY","url":"https://cyber.eventmonitor.net/incident/EM-20261110-D4MY/critical-mailcow-vulnerability-cve-2026-125757/","type":"cve","title":"Critical mailcow Vulnerability (CVE-2026-125757)","subtitle":"CVE-2026-125757","subject":"CVE-2026-125757","status":"Developing","severity":"critical","affected":[],"headline":null,"born":"2026-11-10T16:38:30.000Z","firstSignal":"2026-11-10T16:17:23.107Z","lastSignal":"2026-11-10T16:38:30.000Z","updated":"2026-11-11T15:44:07.320Z","revision":1,"life":[{"status":"Born","at":"2026-11-10T16:38:30.000Z","why":"second independent source: C31 Vulners (new public exploits)"},{"status":"Developing","at":"2026-11-10T16:38:30.000Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-11-10T16:17:23.107Z","what":"First signal: C6 NVD CVE API 2.0"},{"at":"2026-11-10T16:38:30.000Z","what":"Born: second source, C31 Vulners (new public exploits). Page EM-20261110-D4MY created."}],"stages":[{"name":"Disclosed","at":"2026-11-10T16:17:23.107Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-11-10T16:17:23.107Z","detail":"CVSS 9.4"},{"name":"Exploited","at":null,"detail":"No exploitation reported"},{"name":"Advisories","at":null,"detail":"None yet"},{"name":"Vendor Response","at":null,"detail":"None in sources yet"},{"name":"Resolved","at":null,"detail":"After 14 quiet days"}],"signals":[{"at":"2026-11-10T16:17:23.107Z","source":"C6","sourceName":"NVD CVE API 2.0","role":"Database","severity":4,"title":"CVE-2026-125757 (CVSS 9.4)","text":"mailcow: dockerized before 2026-11 contains a server-side template injection vulnerability that allows domain administrators to execute commands in the shared rspamd container by storing a malicious domain-wide footer. Attackers can embed a Jinja macro with an os.execute default value, rendered by the rspamd MOO_FOOTER prefilter, to read or inject mail for every tenant and disable filtering.","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-125757"},{"at":"2026-11-10T16:38:30.000Z","source":"C31","sourceName":"Vulners (new public exploits)","role":"Research & News","severity":3,"title":"Public exploit: Exploit for CVE-2026-125757","text":"# mailcow footer SSTI → RCE in the shared rspamd container\n\nA domain administrator can store a domain-wide footer whose HTML is kept verbatim and later rendered by\nrspamd's jinja/lupa engine on the next authenticated outbound message of the domain. A jinja macro\n*default value* in the footer is…","url":"https://github.com/Faceless0x7/CVE-2026-125757"}],"crowd":[],"reference":{"nvd":{"published":"2026-11-10T16:17:23.107","score":9.4,"severity":"CRITICAL","desc":"mailcow: dockerized before 2026-11 contains a server-side template injection vulnerability that allows domain administrators to execute commands in the shared rspamd container by storing a malicious domain-wide footer. Attackers can embed a Jinja macro with an os.execute default value, rendered by…","product":"","seen":1794338539165},"kev":null,"epss":null,"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}