CVE-2026-54563: Cloudreve path traversal in WebDAV scoped credentials

CVE-2026-54563 · Severity: high · CVSS 7.1 · Published 2026-07-15

Cloudreve's WebDAV service allows users to access files through a web-based sync interface with limited permissions. A vulnerability in the /dav endpoint fails to validate that scoped WebDAV credentials stay within their assigned folder, allowing an attacker to read, list, create, and delete files across the entire user's account using path traversal techniques like `%2e%2e` (encoded `..`).

Technologies: Cloudreve, github.com/cloudreve/Cloudreve (Go), github.com/cloudreve/Cloudreve/v3 (Go), github.com/cloudreve/Cloudreve/v4 (Go). Vendors: Cloudreve, Go.

Quick answers

Is CVE-2026-54563 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-54563 being exploited in the wild.
How severe is CVE-2026-54563?
High severity, with a CVSS score of 7.1, published 15 July 2026.
Which products and versions are affected?
Cloudreve < 4.16.1, v3 <= 3.0.0-20250225100611-da4e44b77af4; v4 < 4.0.0-20260606032813-26b6b1044b02; github.com/cloudreve/Cloudreve (Go) SEMVER:introduced=0; github.com/cloudreve/Cloudreve/v3 (Go) <= 3.0.0-20250225100611-da4e44b77af4, SEMVER:introduced=0, SEMVER:introduced=0,last_affected=3.0.0-20250225100611-da4e44b77af4; github.com/cloudreve/Cloudreve/v4 (Go) < 4.0.0-20260606032813-26b6b1044b02, SEMVER:introduced=0,fixed=4.0.0-20260606032813-26b6b1044b02.
Is there a fix for CVE-2026-54563?
Yes. github.com/cloudreve/Cloudreve/v4 (Go): upgrade to 4.0.0-20260606032813-26b6b1044b02 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-54563 attacked?
It is attacked over the network.
Am I affected by CVE-2026-54563?
Check whether you run Cloudreve, github.com/cloudreve/Cloudreve (Go), github.com/cloudreve/Cloudreve/v3 (Go) or one of the others listed 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/cloudreve/Cloudreve/v4 (Go): upgrade to 4.0.0-20260606032813-26b6b1044b02 or later
    go get github.com/cloudreve/Cloudreve/v4@v4.0.0-20260606032813-26b6b1044b02

Technical details

The WebDAV request handler in `pkg/webdav/webdav.go` (function `stripPrefix`) trims the `/dav` prefix from incoming requests and joins the remainder to a credential's base folder using `fs.URI.JoinRaw`, but performs no validation that the resulting path stays within the configured root. Go's `net/http` server decodes URL-encoded sequences (`%2e%2e` to `..`, `%2f` to `/`) before passing the path to handlers, and the `JoinRaw` method delegates to Go's standard `url.URL.JoinPath`, which resolves `..` segments. A request like `GET /dav/%2e%2e/outside.txt` against a credential rooted at `cloudreve://my/restricted` resolves to `cloudreve://my/outside.txt`, escaping the scope. Read-only credentials can read and list files outside their folder; writable credentials can also create, overwrite, move, and delete them. The breach is contained within a single user's namespace; it does not cross to other users or the OS filesystem. A patch is available and adds a post-join containment check using the existing `EqualOrIsDescendantOf` predicate.

Affected products

  • Cloudreve Cloudreve v3 <= 3.0.0-20250225100611-da4e44b77af4; v4 < 4.0.0-20260606032813-26b6b1044b02

Identifiers

  • CVE-2026-54563
  • GHSA-w5fv-7x5q-g8qp
  • GO-2026-6298

Timeline

  • 2026-07-08: disclosed: Published to GitHub Advisory Database
  • 2026-08-26: advisory: GitHub Security Advisory GHSA-w5fv-7x5q-g8qp published
  • 2026-06-06: patched: Cloudreve v4.0.0-20260606032813-26b6b1044b02 includes fix

References

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