CVE-2026-88017

HIGHPre-NVD 7.37.3—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 85% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.3
EG Score
7.3(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity73% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

September 10, 2026

Last Modified

September 14, 2026

Advisory Details (3)

Auto-updated Sep 10, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

rclone v1.75.1

Patch available: rclone/rclone v1.75.1

https://github.com/rclone/rclone/releases/tag/v1.75.1
github_commit

commit c6af0b57c2b4 (rclone/rclone)

Fix landed in rclone/rclone commit c6af0b57c2b4 — awaiting tagged release

https://github.com/rclone/rclone/commit/c6af0b57c2b4af848bc968c2b407354476184b99
github Patch Available🟡 PoC Available

FTP cross-session auth-proxy backend confusion · Advisory · rclone/rclone · GitHub

https://github.com/rclone/rclone/security/advisories/GHSA-c476-6w5q-jw77

Vendor Advisories for CVE-2026-88017(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/rclone/rclone—1.75.1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 22× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 05:58 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-17 19:47 UTCEG score recompute
  4. 2026-09-17 19:32 UTCEPSS rescore
  5. 2026-09-16 18:09 UTCEG score recompute
  6. 2026-09-16 14:09 UTCEPSS rescore
  7. 2026-09-16 06:23 UTCEG score recompute
  8. 2026-09-16 05:15 UTCEPSS rescore
  9. 2026-09-15 07:36 UTCEG score recompute
  10. 2026-09-15 03:12 UTCEPSS rescore
  11. 2026-09-13 18:54 UTCEG score recompute
  12. 2026-09-13 16:48 UTCEPSS rescore
  13. 2026-09-12 20:07 UTCEG score recompute
  14. 2026-09-12 15:02 UTCEPSS rescore
  15. 2026-09-11 21:23 UTCEG score recompute
  16. 2026-09-11 20:47 UTCEG score recompute
  17. 2026-09-11 18:43 UTCEG score recompute
  18. 2026-09-11 14:53 UTCEPSS rescore
  19. 2026-09-11 14:53 UTCEPSS rescore
  20. 2026-09-10 16:20 UTCEG score recompute
  21. 2026-09-10 16:00 UTCEG score recompute
  22. 2026-09-10 16:00 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-88017?
CVE-2026-88017 is a high vulnerability published on September 10, 2026. 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…
When was CVE-2026-88017 disclosed?
CVE-2026-88017 was first published in the National Vulnerability Database on September 10, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88017 actively exploited?
CVE-2026-88017 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 85.3% of all scored CVEs.
What is the CVSS score of CVE-2026-88017?
CVE-2026-88017 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-88017?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-88017, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-88017

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