CVE-2026-88044 rclone - Authentication Bypass

rclone 1.70.0 to 1.75.1 contains an authentication proxy bypass caused by incorrect checking of process-global proxy.Opt.AuthProxy instead of per-server proxyOpt.AuthProxy in FTP and S3 constructors, letting attackers bypass intended proxy authentication, exploit requires crafted requests to affected RC interface.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.49% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
10 September 2026
Updated
15 October 2026
Weakness
CWE-863

Vendor fix

Upgrade to version 1.75.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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