CVE-2026-44183 Auth bypass in Cleanuparr
Unauthenticated attackers can gain admin access by spoofing X-Forwarded-For headers when reverse-proxy mode is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-44183?
CVE-2026-44183 is a critical authentication bypass vulnerability in Cleanuparr, published on 12 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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, 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.
Which versions are affected by CVE-2026-44183?
How do I fix CVE-2026-44183?
No fix has been published for CVE-2026-44183 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-44183 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44183 exists.
Sources
Also known as GHSA-8q44-v65j-jc3q.