Path Traversal in Cloudreve
CVE-2026-55495
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.
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.003 (17.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Cloudreve — versions < 4.17.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-55495?
- CVE-2026-55495 is a medium-severity vulnerability in Cloudreve, classified under Path Traversal. CVSS score: 4.3/10. Published 2026-07-31.
- How severe is CVE-2026-55495?
- Medium severity. CVSS v3 base score is 4.3 out of 10.