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RustFS: ListRemoteTargetHandler authorization bypass leaks replication target credentials

Type: advisorySources: OSV

RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.1 until 1.0.0-beta.9, RustFS contains an authorization bypass in the bucket replication admin API. The ListRemoteTargetHandler handler for listing remote replication targets only checks whether request credentials exist, but does not verify that the caller has replication or administrator permissions. As a result, an authenticated user with no effective bucket or admin permissions can list remote replication target configuration for a bucket. Because the returned BucketTarget objects include remote target credentials, this can disclose replication access keys and secret keys. This vulnerability is fixed in 1.0.0-beta.9.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-55188
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 11:01 UTC · Revision 1

Source evidence

RustFS: ListRemoteTargetHandler authorization bypass leaks replication target credentials

core-osv · Original source

Published 26 Jun 2026, 20:03 UTC

RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.1 until 1.0.0-beta.9, RustFS contains an authorization bypass in the bucket replication admin API. The ListRemoteTargetHandler handler for listing remote replication targets only checks whether request credentials exist, but does not verify that the caller has replication or administrator permissions. As a result, an authenticated user with no effective bucket or admin permissions can list remote replication target configuration for a bucket. Because the returned BucketTarget objects include remote target credentials, this can disclose replication access keys and secret keys. This vulnerability is fixed in 1.0.0-beta.9.

osv:CVE-2026-55188
Complete source record
{
  "id": "ec36bbc9e2f3c70fbd54340fd8accff560f6009b7d73d8f0d77db003bfb7f0ee",
  "url": "https://osv.dev/vulnerability/CVE-2026-55188",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RustFS: ListRemoteTargetHandler authorization bypass leaks replication target credentials",
    "summary": "RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.1 until 1.0.0-beta.9, RustFS contains an authorization bypass in the bucket replication admin API. The ListRemoteTargetHandler handler for listing remote replication targets only checks whether request credentials exist, but does not verify that the caller has replication or administrator permissions. As a result, an authenticated user with no effective bucket or admin permissions can list remote replication target configuration for a bucket. Because the returned BucketTarget objects include remote target credentials, this can disclose replication access keys and secret keys. This vulnerability is fixed in 1.0.0-beta.9.",
    "evidence": "osv:CVE-2026-55188",
    "products": [],
    "severity": "high",
    "structured": {
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      "aliases": [
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        "GHSA-796f-j7xp-hwf4"
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N"
        }
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      "affected": [
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      "modified": "2026-10-28T02:30:28.130293766Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55188.json",
        "https://github.com/rustfs/rustfs/security/advisories/GHSA-796f-j7xp-hwf4",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-55188"
      ],
      "provider_metadata": {
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        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55188.json"
      }
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    "related_cves": [
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494795,
  "published_at": "2026-06-26T20:03:52.699+00:00"
}