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vuln-cve/data/2026/75xxx/CVE-2026-75872.json
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{
"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"
},
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"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"
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],
"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"
}
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"defaultStatus": "unaffected"
}
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"negate": false,
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"vulnerable": true,
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"versionEndExcluding": "1.1.3"
}
]
}
]
}
],
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"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."
}
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"tags": [
"x_open-source"
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{
"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"
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}
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"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"
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}
],
"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": {
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}
},
"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"
}
}
]
}
}