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CVE-2026-88044

rclone: RC per-server auth-proxy bypass

CRITICAL
9.1
CVSS Score
Published: September 10, 2026 at 04:08 PM UTC
Updated: September 10, 2026 at 08:08 PM UTC
1 product affected across 1 vendorRclone

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Severity
CRITICAL9.1
Exploit prediction
EPSS 0.5%
SSVC
PoC

Description

rclone is a command-line program to sync files and directories to and from different cloud storage providers. From 1.70.0 until 1.75.1, the serve/start RC interface accepts per-server proxyOpt.AuthProxy settings, and the FTP and S3 constructors in cmd/serve/ftp/ftp.go and cmd/serve/s3/server.go incorrectly check the process-global proxy.Opt.AuthProxy value instead. When the global value is empty, the request-local authentication proxy is ignored: FTP falls back to the fixed filesystem with username anonymous and any password, while S3 with AuthKey serves the fixed RC fs rather than the backend selected by the proxy. The dedicated command-line servers that configure the global option are not affected. This issue is fixed in version 1.75.1.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Rclone· Rclonego
60%
v < 1.75.1
Affected range stops below 1.75.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_CONFIRM
Source: cverecord
https://github.com/rclone/rclone/security/advisories/GHSA-p569-5gjg-9cmj
x_refsource_MISC
Source: cverecord
https://github.com/rclone/rclone/commit/739403963abf6f58003c2becd5f7c4ad0d644153
x_refsource_MISC
Source: cverecord
https://github.com/rclone/rclone/releases/tag/v1.75.1

SSVC — Action Prioritization

SSVCPoCNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.1CRITICALGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-863

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