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CVE-2026-88018

9.8 · CRITICAL

rclone is a command-line program to sync files and directories to and from different cloud storage providers.

Published Sep 10, 2026rcloneCWE-287EPSS 0.51%

Overview

CVE-2026-88018 is a critical-severity vulnerability affecting rclone rclone. It was published on September 10, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.1, rclone serve s3 configured with --auth-proxy but without --auth-key allows authPairMiddleware to register any client-chosen accessKeyID with an empty ws.s3Secret. gofakes3 then verifies the request’s SigV4 signature against that same empty secret, while Server.auth passes the access key identifier as both the user and authentication value to the proxy without an independent per-identity secret. An unauthenticated network attacker can therefore choose an arbitrary access key, sign with an empty secret, and reach whatever backend the auth-proxy script resolves for that identity. This issue is fixed in version 1.75.1.

Remediation

Check the references section for vendor advisories and patches from rclone. Update rclone to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
rclonerclone>= 0, < 1.75.1Affected

References

GitHubgithub.com/rclone/rclone/commit/90595f34f27f569be6b27c57fe5ab65057d323bdGitHubgithub.com/rclone/rclone/releases/tag/v1.75.1GitHubgithub.com/rclone/rclone/security/advisories/GHSA-xwwr-4h3p-r22cGitHubgithub.com/rclone/rclone/security/advisories/GHSA-xwwr-4h3p-r22c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-88018?

CVE-2026-88018 is a critical-severity vulnerability affecting rclone rclone. It was published on September 10, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-88018?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-88018?

Check the references section for vendor advisories and patches from rclone. Update rclone to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-88018?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-88018 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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