CVE-2026-44184 HIGH

CVE-2026-44184: Cleanuparr: Reflective CORS combined with trusted-network auth allows cross-origin admin API reads

Vendor Cleanuparr
Product Cleanuparr
Weakness CWE-346 · Origin validation
Published May 12, 2026
Last update May 12, 2026
View on NVD All CVEs

CVSS base score

8.0/10
Attack vector Adjacent
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

Cleanuparr is a tool for automating the cleanup of unwanted or blocked files in Sonarr, Radarr, and supported download clients like qBittorrent. Prior to 2.9.10, Cleanuparr's global CORS policy reflects every request Origin and combines it with AllowCredentials(). When DisableAuthForLocalAddresses is enabled, the API also authenticates requests purely by source IP via TrustedNetworkAuthenticationHandler. The combination lets any website that an admin (or any user on a trusted IP) visits read authenticated API responses cross-origin — including the admin's permanent API key. This vulnerability is fixed in 2.9.10.

Key dates

02Disclosure timeline

May 12, 2026 CVE published
May 12, 2026 Record updated