Improper access control in Dify - #VU139796
Published: July 27, 2026
Vulnerability identifier: #VU139796
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: LangGenius
Affected software:
Dify
Dify
Detailed vulnerability description
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to improper access control in the /console/api/files/<file_id>/preview endpoint and FileService.get_file_preview() when handling preview requests for user-supplied file identifiers. A remote user can request a preview for another tenant's file_id to disclose sensitive information.
Exploitation requires knowledge of a victim file_id.
Remediation
Install security update from vendor's website.