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CVE-2026-44183— Cleanuparr: X-Forwarded-For leftmost parsing allows remote unauthenticated admin takeover when reverse-proxy mode is enabled

Quick assessment

Affected
Cleanuparr Cleanuparr
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cleanuparr是Cleanuparr开源的一个自动化清理下载队列中无效文件的工具。 Cleanuparr 2.9.10之前版本存在安全漏洞，该漏洞源于TrustedNetworkAuthenticationHandler.ResolveClientIp解析X-Forwarded-For标头最左侧条目作为客户端IP，可能导致未经身份验证的远程攻击者通过伪造本地IP绕过信任网络检查并登录为管理员。

CVSS 9.8 · Critical EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Cleanuparr Cleanuparr < 2.9.10 affected
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I. Basic Information for CVE-2026-44183

Vulnerability Information
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Vulnerability Title
Cleanuparr: X-Forwarded-For leftmost parsing allows remote unauthenticated admin takeover when reverse-proxy mode is enabled
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Cleanuparr 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cleanuparr是Cleanuparr开源的一个自动化清理下载队列中无效文件的工具。 Cleanuparr 2.9.10之前版本存在安全漏洞，该漏洞源于TrustedNetworkAuthenticationHandler.ResolveClientIp解析X-Forwarded-For标头最左侧条目作为客户端IP，可能导致未经身份验证的远程攻击者通过伪造本地IP绕过信任网络检查并登录为管理员。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cleanuparr Cleanuparr < 2.9.10 -

II. Public POCs for CVE-2026-44183

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III. Intelligence Information for CVE-2026-44183

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Vendor Advisories for CVE-2026-44183 (1)

IV. Related Vulnerabilities

Same product: Cleanuparr
Same vendor: Cleanuparr
Same weakness: CWE-290

V. Comments for CVE-2026-44183

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