{"id":"CVE-2026-75872","aliases":["EUVD-2026-60820","GHSA-gj4p-rxxg-6jhm"],"status":"published","title":"HTML Injection in MailerUp double opt-in verification email","description":"HTML Injection in the public subscription form in maalfer MailerUp before 1.1.3 allows unauthenticated remote attackers to have the application send a message carrying arbitrary HTML, to an attacker-chosen address and from the form owner's configured sending identity, via the first_name field of the subscription request, which is interpolated unescaped into the double opt-in verification email.","severity":{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00741,"percentile":0.55073,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-80"],"published":"2026-08-18T14:06:37Z","modified":"2026-10-28T02:30:24Z","products":[{"vendor":"maalfer","product":"mailerup"},{"vendor":"mailerup","product":"mailerup"}],"references":[{"url":"https://github.com/maalfer/mailerup/commit/da4aedc9621911df4ce0cc8f0b321dd6d10f40a5","tags":["patch","fix"]},{"url":"https://github.com/maalfer/mailerup/releases/tag/v1.1.3","tags":["release-notes","advisory"]},{"url":"https://secur0.com/en/cna/cve-list/cve-2026-75872-html-injection-in-mailerup-double-optin-verification-email","tags":["technical-description","article"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-75872","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-gj4p-rxxg-6jhm"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75872.json","tags":["advisory"]},{"url":"https://github.com/maalfer/mailerup","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-75872","title":"HTML Injection in MailerUp double opt-in verification email","description":"HTML Injection in the public subscription form in maalfer MailerUp before 1.1.3 allows unauthenticated remote attackers to have the application send a message carrying arbitrary HTML, to an attacker-chosen address and from the form owner's configured sending identity, via the first_name field of the subscription request, which is interpolated unescaped into the double opt-in verification email.","status":"published","published":"2026-08-18T14:06:37.102Z","modified":"2026-08-18T16:04:29.499Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-80"],"updated_at":"2026-11-02T14:20:07.260654Z"}],"euvd":[{"id":"EUVD-2026-60820","description":"HTML Injection in the public subscription form in maalfer MailerUp before 1.1.3 allows unauthenticated remote attackers to have the application send a message carrying arbitrary HTML, to an attacker-chosen address and from the form owner's configured sending identity, via the first_name field of the subscription request, which is interpolated unescaped into the double opt-in verification email.","status":"published","published":"2026-08-18T14:06:37Z","modified":"2026-08-18T16:04:29Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T18:01:46.405062Z"}],"ghsa":[{"id":"GHSA-gj4p-rxxg-6jhm","title":"HTML Injection in the public subscription form in maalfer MailerUp before 1.1.3 allows...","description":"HTML Injection in the public subscription form in maalfer MailerUp before 1.1.3 allows unauthenticated remote attackers to have the application send a message carrying arbitrary HTML, to an attacker-chosen address and from the form owner's configured sending identity, via the first_name field of the subscription request, which is interpolated 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email.","status":"published","published":"2026-08-18T15:17:15.15Z","modified":"2026-10-22T22:10:00.25Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/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-80"],"updated_at":"2026-11-02T14:12:38.976695Z"}],"osv":[{"id":"CVE-2026-75872","title":"HTML Injection in MailerUp double opt-in verification email","description":"HTML Injection in the public subscription form in maalfer MailerUp before 1.1.3 allows unauthenticated remote attackers to have the application send a message carrying arbitrary HTML, to an attacker-chosen address and from the form owner's configured sending identity, via the first_name field of the subscription request, which is interpolated unescaped into the double opt-in verification email.","status":"published","published":"2026-08-18T14:06:37.102Z","modified":"2026-10-28T02:30:24.132436857Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-80"],"updated_at":"2026-11-02T15:45:17.102988Z"}]}}