CVE-2026-44184CWE-346CWE-942

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

High · published May 12, 2026

CVSS v3.1
8.0
EPSS
0%
Percentile
8.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.0 · HIGH
Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00193 · 8.5th percentile
Weaknesses
CWE-346 · Origin Validation Error; CWE-942 · Permissive Cross-domain Security Policy with Untrusted Domains
Published
2026-05-12T17:33Z
EPSS history
Timeline
  • 12 MAY 17:33Z
    Cleanuparr: Reflective CORS combined with trusted-network auth allows cross-origin admin API reads
    cvelistv5