Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The rclone FTP server in auth-proxy mode (versions 1.64.0 up to, but not including, 1.75.1) keeps one stored password per username across all sessions, so a later login with a different credential for the same username can redirect an already-authenticated session to another backend. An attacker holding a valid auth-proxy credential could read, write, or delete objects in the backend of another accepted credential sharing that username. Upgrade to rclone 1.75.1, which is listed as the fixed version.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.3 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0023, the 14th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:13 UTC First seen by agentprime
- 31 Oct 2026, 14:13 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-c476-6w5q-jw77
- OSV: GHSA-c476-6w5q-jw77
- github.com/rclone/rclone/security/advisories/GHSA-c476-6w5q-jw77
- nvd.nist.gov/vuln/detail/CVE-2026-88017
- github.com/rclone/rclone/commit/c6af0b57c2b4af848bc968c2b407354476184b99
- github.com/rclone/rclone
- github.com/rclone/rclone/releases/tag/v1.75.1