FreeScout has Predictable Attachment Token that Allows Unauthenticated Private File Download via Brute Force_CVE-2026-40496

{
    "lastseen": "",
    "description": "FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, attachment download tokens are generated using a weak and predictable formula: `md5(APP_KEY + attachment_id + size)`. Since attachment_id is sequential and size can be brute-forced in a small range, an unauthenticated attacker can forge valid tokens and download any private attachment without credentials. Version 1.8.213 fixes the issue.",
    "published": "2026-04-21T01:38:50.117Z",
    "modified": "2026-04-21T01:38:50.117Z",
    "type": "cve",
    "title": "FreeScout has Predictable Attachment Token that Allows Unauthenticated Private File Download via Brute Force",
    "source": "GitHub_M",
    "references": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-2783-wxmm-wmwr\nhttps://github.com/freescout-help-desk/freescout/commit/dbdf8f2260b43a21818255c70f0b61b9de9cd555\nhttps://github.com/freescout-help-desk/freescout/releases/tag/1.8.213",
    "id": "CVE-2026-40496",
    "bulletinFamily": "",
    "cwe": [
        "CWE-330",
        "CWE-340"
    ],
    "cvelist": null,
    "sourceData": "freescout-help-desk freescout < 1.8.213",
    "sourceHref": "",
    "cvss": {
        "score": 8.8,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P",
        "version": "4.0"
    },
    "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": "Unauthenticated attackers can download private attachments due to predictable attachment tokens",
    "ai_severity": "High",
    "ai_vendor": "FreeScout",
    "ai_product": "FreeScout Help Desk",
    "ai_version": "< 1.8.213",
    "ai_score": 8.8
}