{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-75872","assignerOrgId":"4daa8cea-433a-44bd-9456-53b127fc289a","state":"PUBLISHED","assignerShortName":"Secur0","dateReserved":"2026-08-18T12:20:39.352Z","datePublished":"2026-08-18T14:06:37.102Z","dateUpdated":"2026-08-18T16:04:29.499Z"},"containers":{"cna":{"providerMetadata":{"orgId":"4daa8cea-433a-44bd-9456-53b127fc289a","shortName":"Secur0","dateUpdated":"2026-08-18T14:06:37.102Z"},"title":"HTML Injection in MailerUp double opt-in verification email","datePublic":"2026-08-18T12:43:00.000Z","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-80","description":"CWE-80 Improper neutralization of Script-Related HTML tags in a web page (basic XSS)","type":"CWE"}]}],"impacts":[{"capecId":"CAPEC-242","descriptions":[{"lang":"en","value":"CAPEC-242 Code Injection"}]}],"affected":[{"vendor":"maalfer","product":"MailerUp","repo":"https://github.com/maalfer/mailerup","modules":["Public subscription form"],"programFiles":["backend/apps/forms/views.py"],"versions":[{"status":"affected","version":"0","lessThan":"1.1.3","versionType":"semver"}],"defaultStatus":"unaffected"}],"cpeApplicability":[{"operator":"OR","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:maalfer:mailerup:*:*:*:*:*:*:*:*","versionStartIncluding":"0","versionEndExcluding":"1.1.3"}]}]}],"descriptions":[{"lang":"en","value":"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.","supportingMedia":[{"type":"text/html","base64":false,"value":"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."}]}],"tags":["x_open-source"],"references":[{"url":"https://github.com/maalfer/mailerup/commit/da4aedc9621911df4ce0cc8f0b321dd6d10f40a5","tags":["patch"]},{"url":"https://github.com/maalfer/mailerup/releases/tag/v1.1.3","tags":["release-notes"]},{"url":"https://secur0.com/en/cna/cve-list/cve-2026-75872-html-injection-in-mailerup-double-optin-verification-email","tags":["technical-description"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"MEDIUM","baseScore":6.9,"vectorString":"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"}}],"solutions":[{"lang":"en","value":"Upgrade to version 1.1.3 or higher.","supportingMedia":[{"type":"text/html","base64":false,"value":"<strong></strong> Upgrade to version 1.1.3 or higher."}]}],"credits":[{"lang":"en","value":"Nacho García Egea","type":"finder"},{"lang":"en","value":"Xoán M. Otero Jorge","type":"analyst"},{"lang":"en","value":"Secur0 CNA","type":"coordinator"},{"lang":"en","value":"Mario Álvarez Fernández","type":"remediation developer"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.4"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-18T16:04:23.484003Z","id":"CVE-2026-75872","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-18T16:04:29.499Z"}}]}}