Vulnerability · Published Jul 31, 2026 · Assigned by GitHub_M
CVE-2026-55495Cloudreve: Path Traversal in WOPI PUT_RELATIVE Allows Arbitrary File Creation in Owner Account
Medium 4.3
In plain English
A medium-severity path traversal in cloudreve from cloudreve. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, the WOPI PUT_RELATIVE handler passes X-WOPI-SuggestedTarget to URI.JoinRaw as a path rather than a filename, allowing slash and dot-dot segments to escape the source file directory and create or conditionally overwrite files elsewhere in the same owner account. This issue is fixed in version 4.17.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/cloudreve/Cloudreve | no fix listed | GO-2026-6097 |
| Go | github.com/cloudreve/Cloudreve/v3 | no fix listed | GHSA-49h3-cwhj-4737 |
| Go | github.com/cloudreve/Cloudreve/v3 | no fix listed | GO-2026-6097 |
| Go | github.com/cloudreve/Cloudreve/v4 | 4.0.0-20260613023150-7968e50429ef | GHSA-49h3-cwhj-4737 |
| Go | github.com/cloudreve/Cloudreve/v4 | 4.0.0-20260613023150-7968e50429ef | GO-2026-6097 |
Affected products (as reported)
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N