Cleanuparr up to 2.9.9 X-Forwarded-For authentication spoofing

Summaryinfo

A vulnerability classified as critical has been found in Cleanuparr up to 2.9.9. This affects an unknown part of the component X-Forwarded-For Handler. The manipulation leads to authentication spoofing. This vulnerability is traded as CVE-2026-44183. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Cleanuparr up to 2.9.9 and classified as critical. This issue affects some unknown processing of the component X-Forwarded-For Handler. The manipulation with an unknown input leads to a authentication spoofing vulnerability. Using CWE to declare the problem leads to CWE-290. This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. Impacted is confidentiality, integrity, and availability. The summary by CVE 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, TrustedNetworkAuthenticationHandler.ResolveClientIp parses the leftmost entry of the X-Forwarded-For header as the client IP. That entry is attacker-controlled — X-Forwarded-For is append-only, so the leftmost value is whatever the original HTTP client claimed. By sending a spoofed local IP in the header, an unauthenticated remote attacker passes the trusted-network check and is logged in as the Cleanuparr administrator. This vulnerability is fixed in 2.9.10.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-44183 since 05/05/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 2.9.10 eliminates this vulnerability.

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Productinfo

Name

• Cleanuparr

Version

• 2.9.0
• 2.9.1
• 2.9.2
• 2.9.3
• 2.9.4
• 2.9.5
• 2.9.6
• 2.9.7
• 2.9.8
• 2.9.9

Website

• Product: https://github.com/Cleanuparr/Cleanuparr/

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CPE 2.2info

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