CVE-2026-79779: rclone before v1.75.0 WebDAV Credential Exposure via HTTPS-to-HTTP Redirect

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-25 · updated 2026-09-10
Weakness: CWE-319

Description

rclone versions before v1.75.0 fail to reject transport downgrades in redirect handling, allowing Basic authorization and Cookie headers to be replayed over plaintext HTTP after same-host HTTPS-to-HTTP redirects. An on-path attacker observing the plaintext hop can capture and reuse credentials to perform WebDAV operations with the compromised account's permissions.

Affected products

rclone: before 1.75.0 — fixed in 1.75.0

How to fix

Upgrade to a fixed version: rclone 1.75.0. Check the vendor advisory for mitigations.

References

https://github.com/rclone/rclone/security/advisories/GHSA-h4mf-4v27-hggj
https://www.vulncheck.com/advisories/rclone-before-webdav-credential-exposure-via-https-to-http-redirect

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