goshs has Cross-Origin Arbitrary File Write via Missing CSRF on PUT and Wildcard CORS_CVE-2026-42091

{
    "lastseen": "",
    "description": "goshs is a SimpleHTTPServer written in Go. Prior to version 2.0.2, the PUT upload handler (httpserver/updown.go) lacks the CSRF token validation that was added to the POST upload handler during the CVE-2026-40883 fix. Combined with the unconditional Access-Control-Allow-Origin: * on the OPTIONS preflight handler (httpserver/server.go), any website can write arbitrary files to a goshs instance through the victim's browser \u2014 bypassing network isolation (e.g. localhost, internal network). This issue has been patched in version 2.0.2.",
    "published": "2026-05-04T17:24:47.890Z",
    "modified": "2026-05-04T17:24:47.890Z",
    "type": "cve",
    "title": "goshs has Cross-Origin Arbitrary File Write via Missing CSRF on PUT and Wildcard CORS",
    "source": "GitHub_M",
    "references": "https://github.com/patrickhener/goshs/security/advisories/GHSA-rhf7-wvw3-vjvm\nhttps://github.com/patrickhener/goshs/commit/0e715b94e10c3d1aa552276000f15f104dee2f32\nhttps://github.com/patrickhener/goshs/releases/tag/v2.0.2",
    "id": "CVE-2026-42091",
    "bulletinFamily": "",
    "cwe": [
        "CWE-352"
    ],
    "cvelist": null,
    "sourceData": "patrickhener goshs < 2.0.2",
    "sourceHref": "",
    "cvss": {
        "score": 6.5,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/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": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "goshs",
    "version": "< 2.0.2",
    "vendor": "patrickhener",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}