RustFS: FTP frontend skips IAM authorization on object reads_CVE-2026-55189

{
    "lastseen": "",
    "description": "RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.1 until 1.0.0-beta.9, when the FTP frontend is enabled, the FTP read and probe handlers dispatch directly to the storage backend without ever calling the IAM authorization function that the FTP write/list handlers (and the entire HTTP S3 path) use. As a result, any user who can authenticate to the FTP listener \u2014 including a user whose IAM policy contains an explicit Deny on s3:GetObject \u2014 can read (RETR) and stat (SIZE/MDTM) any object in any bucket, and probe any bucket (CWD), completely regardless of their IAM policy. This vulnerability is fixed in 1.0.0-beta.9.",
    "published": "2026-06-26T19:59:13.870Z",
    "modified": "2026-06-26T19:59:13.870Z",
    "type": "cve",
    "title": "RustFS: FTP frontend skips IAM authorization on object reads",
    "source": "GitHub_M",
    "references": "https://github.com/rustfs/rustfs/security/advisories/GHSA-3g29-xff2-92vp",
    "id": "CVE-2026-55189",
    "bulletinFamily": "",
    "cwe": [
        "CWE-862",
        "CWE-863"
    ],
    "cvelist": null,
    "sourceData": "rustfs rustfs >= 1.0.0-alpha.1, <= 1.0.0-beta.8",
    "sourceHref": "",
    "cvss": {
        "score": 7.7,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
        "version": "3.1"
    },
    "cvss2": [],
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        "baseScore": 0,
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        "privilegesRequired": "",
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        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "rustfs",
    "version": ">= 1.0.0-alpha.1, <= 1.0.0-beta.8",
    "vendor": "rustfs",
    "ai_description": "",
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    "ai_score": 0
}