# CVE-2026-79779: rclone WebDAV credential exposure via HTTPS-to-HTTP redirect

Source: https://junglewise.ai/threats/cve-2026-79779-rclone-webdav-credential-exposure-via-https-to-http-redirect  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-25. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-79779 · Severity: medium · CVSS 5.3 · Published 2026-08-25

rclone is a command-line utility for syncing files to cloud storage and WebDAV servers. Versions before v1.75.0 fail to reject downgrades from HTTPS to plaintext HTTP when a server redirects traffic, allowing attackers positioned on the network path to intercept and replay authentication credentials (passwords and session cookies) to access the compromised account's WebDAV files.

Technologies: [github.com/rclone/rclone (Go)](https://junglewise.ai/threats/technologies/github-com-rclone-rclone), [Rclone](https://junglewise.ai/threats/technologies/rclone). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [Rclone](https://junglewise.ai/threats/vendors/rclone).

## Quick answers

**Is CVE-2026-79779 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-79779 being exploited in the wild.

**How severe is CVE-2026-79779?** Medium severity, with a CVSS score of 5.3, published 25 August 2026.

**Which products and versions are affected?** github.com/rclone/rclone (Go) SEMVER:introduced=0,fixed=1.75.0; Rclone < v1.75.0.

**Is there a fix for CVE-2026-79779?** Yes. github.com/rclone/rclone (Go): upgrade to 1.75.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-79779 attacked?** It is attacked from the adjacent network.

**Am I affected by CVE-2026-79779?** Check whether you run github.com/rclone/rclone (Go) or Rclone at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/rclone/rclone (Go): upgrade to 1.75.0 or later

  ```sh
  go get github.com/rclone/rclone@v1.75.0
  ```


## Technical details

The vulnerability is a cleartext transmission issue (CWE-319) in rclone's redirect handling for WebDAV backends. The PreserveMethodRedirectFn function in lib/rest/rest.go restores the HTTP method on redirects but fails to reject same-host HTTPS-to-HTTP downgrades or compare the full origin tuple (scheme, hostname, port). As a result, Go's built-in credential-forwarding rules preserve Basic authentication headers and Cookie values even when the new endpoint uses plaintext HTTP. An adjacent or on-path attacker observing the plaintext hop can capture and replay these credentials for WebDAV operations without requiring authentication. The vulnerability requires a legitimate WebDAV endpoint to emit a 307/308 redirect to HTTP on the same hostname and an adjacent network position to intercept traffic. Patches are available in v1.75.0 and later.

## Affected products

- rclone rclone < v1.75.0

## Identifiers

- CVE-2026-79779
- GHSA-h4mf-4v27-hggj
- GO-2026-6197

## Timeline

- 2026-07-31: disclosed
- 2026-08-25: patched: v1.75.0 released

## References

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

## Related threats

- [Rclone B2 backend credential exposure on HTTP redirects](https://junglewise.ai/threats/cve-2026-116196-rclone-before-v1-75-2-contains-a-credential-exposure)
- [Rclone path traversal in translateLink function](https://junglewise.ai/threats/cve-2026-116195-rclone-before-1-75-2-contains-a-path-traversal-vulnerability-in)
- [Rclone cross-site request forgery in pCloud OAuth callback](https://junglewise.ai/threats/cve-2026-116194-rclone-from-1-52-0-before-1-75-2-contains-a-cross-site-request)
- [Rclone serve webdav authentication bypass via OPTIONS requests](https://junglewise.ai/threats/cve-2026-116193-rclone-from-1-64-0-before-1-75-2-contains-an-authentication)
- [rclone server-side request forgery via --rc-serve scheme-relative roots](https://junglewise.ai/threats/cve-2026-116192-rclone-from-1-37-before-1-74-2-contains-a-server-side-request)