FreeScout has HTML Injection in Outgoing Emails via Unsanitized Customer Name in Signature Variables_CVE-2026-40567

{
    "lastseen": "",
    "description": "FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, an unauthenticated attacker can inject arbitrary HTML into outgoing emails generated by FreeScout by sending an email with a crafted From display name. The name is stored in the database without sanitization and rendered unescaped into outgoing reply emails via the `{%customer.fullName%}` signature variable. This allows embedding phishing links, tracking pixels, and spoofed content inside legitimate support emails sent from the organization's address. Version 1.8.213 fixes the issue.",
    "published": "2026-04-21T16:06:39.878Z",
    "modified": "2026-04-21T16:06:39.878Z",
    "type": "cve",
    "title": "FreeScout has HTML Injection in Outgoing Emails via Unsanitized Customer Name in Signature Variables",
    "source": "GitHub_M",
    "references": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-q8v4-v62h-5528\nhttps://github.com/freescout-help-desk/freescout/commit/9131b16f80eade81002cb9809a2603f6b61981cf\nhttps://github.com/freescout-help-desk/freescout/releases/tag/1.8.213",
    "id": "CVE-2026-40567",
    "bulletinFamily": "",
    "cwe": [
        "CWE-116"
    ],
    "cvelist": null,
    "sourceData": "freescout-help-desk freescout < 1.8.213",
    "sourceHref": "",
    "cvss": {
        "score": 5.8,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "freescout",
    "version": "< 1.8.213",
    "vendor": "freescout-help-desk",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}