Scoped file access bypass via decoded traversal
Published Jul 15, 2026 · Updated Jul 15, 2026
Path traversal in Cloudreve before 4.16.1 allows remote authenticated users to access files beyond a scoped WebDAV account root. The stripPrefix handler in pkg/webdav/webdav.go joins the decoded request suffix to the configured root with fs.URI.JoinRaw but never verifies that the result remains beneath that root. A scoped WebDAV credential is required; reads and listings remain inside the same user's namespace, while writable credentials also permit creation, overwrite, movement, and deletion.
Summary
What happened
Path traversal in Cloudreve before 4.16.1 allows remote authenticated users to access files beyond a scoped WebDAV account root. The stripPrefix handler in pkg/webdav/webdav.go joins the decoded request suffix to the configured root with fs.URI.JoinRaw but never verifies that the result remains beneath that root. A scoped WebDAV credential is required; reads and listings remain inside the same user's namespace, while writable credentials also permit creation, overwrite, movement, and deletion.
The record
- CVE
- CVE-2026-54563
- Published
- Jul 15, 2026
- Updated
- Jul 15, 2026
- Vendor
- Cloudreve
- Product
- Cloudreve
- Classifications
- CWE-863, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 15, 2026CVE publishedPublication date reported by the CVE source.
- Jul 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 4.16.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- GHSA-w5fv-7x5q-g8qp WebDAV traversal proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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