CVE-2026-88017Public exploitNetwork attack vector

Cross-tenant backend access via session credential overwrite

Published Sep 10, 2026 · Updated Sep 10, 2026

Authorization bypass in rclone 1.64.0 through 1.75.0 allows remote authenticated users to access another FTP proxy backend. The FTP driver stores one obscured password per username in a server-wide map, so getVFS reauthorizes an existing session with the latest matching password. Exploitation requires distinct accepted credentials for one username and a later login while the first session stays open, enabling read, create, overwrite, rename, and delete operations with the second backend's authority.

CVSS severity7.3
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in rclone 1.64.0 through 1.75.0 allows remote authenticated users to access another FTP proxy backend. The FTP driver stores one obscured password per username in a server-wide map, so getVFS reauthorizes an existing session with the latest matching password. Exploitation requires distinct accepted credentials for one username and a later login while the first session stays open, enabling read, create, overwrite, rename, and delete operations with the second backend's authority.

The record

CVE
CVE-2026-88017
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
Rclone
Product
rclone
Classifications
CWE-488, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.64.0, < 1.75.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Rclone · rcloneversion=>= 1.64.0, < 1.75.1

Published CVSS scores

7.3Rclone GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-488Exposure of Data Element to Wrong Session
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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