Authentication bypass by spoofing in Cleanuparr
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-290.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cleanuparr | Cleanuparr | before 2.9.10 | 2.9.10 | Patch available | CNA |
- Cleanuparr VendorCleanuparr Affected before 2.9.10 Fixed in 2.9.10 Patch available CNA
Remediation
- Fix · CNA Cleanuparr (Cleanuparr) Fixed in 2.9.10
Timeline
- 2026-10-02 Threatist record created from CVE-2026-44183
More Cleanuparr vulnerabilities
- TI-2026-32163 Cleanuparr: Reflective CORS combined with trusted-network auth allows cross-origin admin API reads CVSS 3.1HIGH 8.0
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences