ContiNew Admin through 4.1.0 Missing Authorization and File-Type Allowlist on Multipart Upload Endpoints

Advisories

ContiNew Admin through 4.1.0 Missing Authorization and File-Type Allowlist on Multipart Upload Endpoints

severity: medium
date: 8/25/2026
Affecting: continew-admin <= 4.1.0
CVE: CVE-2026-80050
CWE: CWE-434 Unrestricted Upload of File with Dangerous Type
CVSS: 7.1
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
References: https://github.com/continew-org/continew-admin
https://github.com/continew-org/continew-admin/issues/221
https://github.com/continew-org/continew-admin/blob/v4.1.0/continew-system/src/main/java/top/continew/admin/system/controller/MultipartUploadController.java
Credit: George Chen
Description: ContiNew Admin fails to apply file-upload permission checks or file-type allowlist validation to multipart upload endpoints, allowing authenticated users to store files with arbitrary extensions. Attackers can initialize chunked uploads, send file parts, and complete uploads to leave arbitrary files in the storage backend accessible via web server URLs.

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