Vulnerability-Lookup

Vulnerability from bitnami_vulndb

Published

2026-09-15 08:49

Modified

2026-09-15 09:01

Summary

rclone: FTP cross-session auth-proxy backend confusion

Details

rclone is a command-line program to sync files and directories to and from different cloud storage providers. From 1.64.0 until 1.75.1, the FTP auth-proxy driver in cmd/serve/ftp/ftp.go stores one obscured password per username in the server-wide userPass map[string]string instead of binding the credential or VFS to the authenticated session. If two accepted credentials use the same username but resolve to different proxy backends, a later CheckPasswd login overwrites userPass[user], and subsequent getVFS operations on the first session are reauthorized with the later password. The first session can then read, create, overwrite, rename, or delete objects using the second credential’s backend authority. Exploitation requires the later same-username login to occur while the first session remains open. This issue is fixed in version 1.75.1.

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "rclone",
        "purl": "pkg:bitnami/rclone"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.64.0"
            },
            {
              "fixed": "1.75.1"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-88017"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:rclone:rclone:*:*:*:*:*:*:*:*"
    ],
    "severity": "High"
  },
  "details": "rclone is a command-line program to sync files and directories to and from different cloud storage providers. From 1.64.0 until 1.75.1, the FTP auth-proxy driver in cmd/serve/ftp/ftp.go stores one obscured password per username in the server-wide userPass map[string]string instead of binding the credential or VFS to the authenticated session. If two accepted credentials use the same username but resolve to different proxy backends, a later CheckPasswd login overwrites userPass[user], and subsequent getVFS operations on the first session are reauthorized with the later password. The first session can then read, create, overwrite, rename, or delete objects using the second credential\u2019s backend authority. Exploitation requires the later same-username login to occur while the first session remains open. This issue is fixed in version 1.75.1.",
  "id": "BIT-rclone-2026-88017",
  "modified": "2026-09-15T09:01:14.338Z",
  "published": "2026-09-15T08:49:34.130Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/rclone/rclone/commit/c6af0b57c2b4af848bc968c2b407354476184b99"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/rclone/rclone/releases/tag/v1.75.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/rclone/rclone/security/advisories/GHSA-c476-6w5q-jw77"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-88017"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "rclone: FTP cross-session auth-proxy backend confusion"
}

CVE-2026-88017 (GCVE-0-2026-88017)

Vulnerability from cvelistv5 – Published: 2026-09-10 15:55 – Updated: 2026-09-11 20:33

Title

rclone: FTP cross-session auth-proxy backend confusion

Summary

Severity

7.3 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-11 16:48 UTC

CWE

CWE-488 - Exposure of Data Element to Wrong Session

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/rclone/rclone/security/advisor…	x_refsource_CONFIRM
https://github.com/rclone/rclone/commit/c6af0b57c…	x_refsource_MISC
https://github.com/rclone/rclone/releases/tag/v1.75.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
rclone	rclone	Affected: >= 1.64.0, < 1.75.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-88017",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-11T16:48:39.156188Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-11T20:33:16.810Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "rclone",
          "vendor": "rclone",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.64.0, \u003c 1.75.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "rclone is a command-line program to sync files and directories to and from different cloud storage providers. From 1.64.0 until 1.75.1, the FTP auth-proxy driver in cmd/serve/ftp/ftp.go stores one obscured password per username in the server-wide userPass map[string]string instead of binding the credential or VFS to the authenticated session. If two accepted credentials use the same username but resolve to different proxy backends, a later CheckPasswd login overwrites userPass[user], and subsequent getVFS operations on the first session are reauthorized with the later password. The first session can then read, create, overwrite, rename, or delete objects using the second credential\u2019s backend authority. Exploitation requires the later same-username login to occur while the first session remains open. This issue is fixed in version 1.75.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-488",
              "description": "CWE-488: Exposure of Data Element to Wrong Session",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-10T15:55:15.871Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/rclone/rclone/security/advisories/GHSA-c476-6w5q-jw77",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/rclone/rclone/security/advisories/GHSA-c476-6w5q-jw77"
        },
        {
          "name": "https://github.com/rclone/rclone/commit/c6af0b57c2b4af848bc968c2b407354476184b99",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rclone/rclone/commit/c6af0b57c2b4af848bc968c2b407354476184b99"
        },
        {
          "name": "https://github.com/rclone/rclone/releases/tag/v1.75.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/rclone/rclone/releases/tag/v1.75.1"
        }
      ],
      "source": {
        "advisory": "GHSA-c476-6w5q-jw77",
        "discovery": "UNKNOWN"
      },
      "title": "rclone: FTP cross-session auth-proxy backend confusion"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-88017",
    "datePublished": "2026-09-10T15:55:15.871Z",
    "dateReserved": "2026-09-09T19:19:27.407Z",
    "dateUpdated": "2026-09-11T20:33:16.810Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

Vulnerability from bitnami_vulndb

CVE-2026-88017 (GCVE-0-2026-88017)

Tags

Sightings

Nomenclature