Budibase: Unauthenticated S3 signed upload URL generation allows arbitrary writes with stored datasource credentials_CVE-2026-50136

{
    "lastseen": "",
    "description": "Budibase is an open-source low-code platform. Prior to 3.39.3, the application server exposes an unauthenticated endpoint that generates S3 PutObject presigned URLs using credentials stored in a workspace datasource. The route is protected only by the recaptcha middleware and does not require authentication, table permission, datasource permission, or builder access. A public caller who knows a workspace ID and S3 datasource ID can request a signed upload URL for attacker-controlled bucket and key values. This vulnerability is fixed in 3.39.3.",
    "published": "2026-06-26T20:36:54.016Z",
    "modified": "2026-06-26T20:36:54.016Z",
    "type": "cve",
    "title": "Budibase: Unauthenticated S3 signed upload URL generation allows arbitrary writes with stored datasource credentials",
    "source": "GitHub_M",
    "references": "https://github.com/Budibase/budibase/security/advisories/GHSA-jj36-r9w3-3pfh",
    "id": "CVE-2026-50136",
    "bulletinFamily": "",
    "cwe": [
        "CWE-306"
    ],
    "cvelist": null,
    "sourceData": "Budibase budibase < 3.39.3",
    "sourceHref": "",
    "cvss": {
        "score": 7.4,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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            "baseScore": 0,
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "budibase",
    "version": "< 3.39.3",
    "vendor": "Budibase",
    "ai_description": "",
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    "ai_score": 0
}