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Vulnerability record · CVE-2026-88017 · published 10 September 2026

CVE-2026-88017: Rclone vulnerability

Rclone · Rclone

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.

7.3 CVSS 3.1 High EPSS 0.43% · top 65.7% CWE-488 · CWE-488
7.3CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
14 Sep 2026Last modified by NVD

Description

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/rclone/rclone/commit/c6af0b57c2b4af848bc968c2b407354476184b99 Patch
https://github.com/rclone/rclone/releases/tag/v1.75.1 Release Notes
https://github.com/rclone/rclone/security/advisories/GHSA-c476-6w5q-jw77 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-88018Rclone improper authentication vulnerabilityrclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.1, rclone serve s3 config…EPSS 0.75%9.8CVE-2026-49980Rclone missing authentication for critical function vulnerabilityRclone is a command-line program to sync files and directories to and from different cloud storage providers. From 1.46.0 until 1.74.3, rclone rcd --…EPSS 0.78%9.2CVE-2026-41176Rclone missing authentication for critical function vulnerabilityRclone is a command-line program to sync files and directories to and from different cloud storage providers. The RC endpoint `options/set` is expose…EPSS 3.2%9.2CVE-2026-41179Rclone os command injection vulnerabilityRclone is a command-line program to sync files and directories to and from different cloud storage providers. Starting in version 1.48.0 and prior to…EPSS 5.3%8.8CVE-2026-59733Rclone path traversal vulnerabilityRclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.74.4, rclone serve restic --…EPSS 0.55%8.8CVE-2026-54572Rclone link following vulnerabilityRclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.74.4, with -l/--links, rclon…EPSS 0.40%7.5CVE-2020-28924Rclone vulnerabilityAn issue was discovered in Rclone before 1.53.3. Due to the use of a weak random number generator, the password generator has been producing weak pas…EPSS 1.4%7.5CVE-2018-12907Rclone information exposure vulnerabilityIn Rclone 1.42, use of "rclone sync" to migrate data between two Google Cloud Storage buckets might allow attackers to trigger the transmission of an…EPSS 1.3%

Source: NIST National Vulnerability Database (record CVE-2026-88017), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.