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CVE-2026-88044

rclone: RC per-server auth-proxy bypass

Published: Sep 10, 2026Updated: Sep 10, 2026 Sources: CVE List NVDCWE-863
9.1CRITICAL
NVD MITRE
EPSS Score
0.5%
Top 59.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-863

Affected Products

rclone
oss-project
rcloneMixed
Consumer Software / file-utility

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
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References

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

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