Vulnerability · Published May 12, 2026 · Assigned by GitHub_M

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

High 8.0

In plain English

A high-severity security flaw in Cleanuparr from Cleanuparr. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).

Severity (CVSS 3.1)8.0High

Exploit odds (30 days)0.1%top 98.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Cleanuparr	Cleanuparr	< 2.9.10

Weakness: CWE-346, CWE-942 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

https://github.com/Cleanuparr/Cleanuparr/security/advisories/GHSA-rwpc-36mg-fpvf x_refsource_CONFIRM