{"cve":"CVE-2026-88017","nvd":{"published":"2026-09-10T16:18:08.773","modified":"2026-09-14T20:00:53.363","status":"Analyzed","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N","score":7.3},"cwes":["CWE-488"],"references":["https://github.com/rclone/rclone/commit/c6af0b57c2b4af848bc968c2b407354476184b99","https://github.com/rclone/rclone/releases/tag/v1.75.1","https://github.com/rclone/rclone/security/advisories/GHSA-c476-6w5q-jw77"],"products":["rclone:rclone"],"source":"nvd","synced_at":"2026-10-19T22:52:53.108888569+00:00"},"epss":{"cve":"CVE-2026-88017","score":0.00234,"percentile":0.14372,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-c476-6w5q-jw77","url":"https://osv.dev/vulnerability/GHSA-c476-6w5q-jw77","summary":"rclone: FTP cross-session auth-proxy backend confusion","modified":"2026-09-17T17:40:51.444163094Z","packages":[{"ecosystem":"Go","name":"github.com/rclone/rclone","purl":"pkg:golang/github.com/rclone/rclone","ranges":[">=1.64.0 <1.75.1"],"fixed":["1.75.1"]}]},{"id":"GO-2026-6458","url":"https://osv.dev/vulnerability/GO-2026-6458","summary":"rclone: FTP cross-session auth-proxy backend confusion in github.com/rclone/rclone","modified":"2026-09-17T17:40:51.444163094Z","packages":[{"ecosystem":"Go","name":"github.com/rclone/rclone","purl":"pkg:golang/github.com/rclone/rclone","ranges":[">=1.64.0 <1.75.1"],"fixed":["1.75.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}