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CVE-2026-45556— Roxy-WI: Authenticated arbitrary file write on every managed load balancer (and downstream RCE) via WAF rule save `config_file_name`

Quick assessment

Affected
roxy-wi roxy-wi
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Roxy-WI是Roxy-WI开源的一款用于管理 Haproxy、Nginx 和 Keepalived 服务器的 Web 界面。 Roxy-WI 8.2.6.4及之前版本存在输入验证错误漏洞，该漏洞源于POST /waf/<service>/<server_ip>/rule/<rule_id>/save端点接受config_file_name表单字段并直接传递给config_mod.master_slave_upload_and_restart作为目标路径，验证链仅要求路径包含硬编码服务子字符串和conf

CVSS 9.9 · Critical EPSS 0.59% · P46

Possible ATT&CK Techniques 1 AI

T1505.003 · Web Shell

Affected Version Matrix 1

VendorProduct Version RangeStatus
roxy-wi roxy-wi <= 8.2.6.4 affected
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I. Basic Information for CVE-2026-45556

Vulnerability Information
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Vulnerability Title
Roxy-WI: Authenticated arbitrary file write on every managed load balancer (and downstream RCE) via WAF rule save `config_file_name`
Source: CVE Program / CVE List V5
Vulnerability Description
Roxy-WI is a web interface for managing Haproxy, Nginx, Apache and Keepalived servers. In versions 8.2.6.4 and prior, POST /waf/<service>/<server_ip>/rule/<rule_id>/save accepts a config_file_name form field that is passed straight through to config_mod.master_slave_upload_and_restart(...) as the destination path. The validation chain (_replace_config_path_to_correct → check_is_conf) only requires the path to contain a hard-coded service substring (nginx/haproxy/apache2/httpd/keepalived) and the substring conf or cfg, and to not contain ... The encoded-slash substitution 92 → / is applied before the substring check, so the attacker can build any absolute path anywhere on the LB filesystem as long as it satisfies those substring constraints. The body of the WAF rule (config form field) is written verbatim to that path. By choosing a filename like 92etc92cron.d92nginx_cfg_evil (resolving to /etc/cron.d/nginx_cfg_evil), an attacker drops a cron entry on the load balancer with attacker-controlled content. Cron parses the file on its next scan, executing the embedded job as root — full RCE on every load balancer the caller's group manages. At time of publication, there are no publicly available patches.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Roxy-WI 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Roxy-WI是Roxy-WI开源的一款用于管理 Haproxy、Nginx 和 Keepalived 服务器的 Web 界面。 Roxy-WI 8.2.6.4及之前版本存在输入验证错误漏洞，该漏洞源于POST /waf/<service>/<server_ip>/rule/<rule_id>/save端点接受config_file_name表单字段并直接传递给config_mod.master_slave_upload_and_restart作为目标路径，验证链仅要求路径包含硬编码服务子字符串和conf
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
roxy-wi roxy-wi <= 8.2.6.4 -

II. Public POCs for CVE-2026-45556

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8052 chars
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III. Intelligence Information for CVE-2026-45556

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Vendor Advisories for CVE-2026-45556 (1)

Same Patch Batch · roxy-wi · 2026-06-10 · 14 CVEs total

CVE-2026-45558 9.9 CRITICAL Roxy-WI: Authenticated RCE on every managed HAProxy load balancer via `option` field confi
CVE-2026-45552 9.9 CRITICAL Roxy-WI: Cross-tenant authorization bypass on /install/* — guest can run Ansible / SSH on
CVE-2026-45550 9.1 CRITICAL Roxy-WI: IDOR on PUT /smon/check — any user can rewrite any tenant's monitoring URL/IP/bod
CVE-2026-45564 8.8 HIGH Roxy-WI: Authenticated RCE via 'configver' URL parameter (os.system sink in /config/versio
CVE-2026-45549 8.5 HIGH Roxy-WI: Authorization bypass on POST /smon/agent/action/<action> — guest can stop or rest
CVE-2026-45567 8.3 HIGH Roxy-WI: Authentication bypass via 'api' substring in URL + unauthenticated /api/gpt
CVE-2026-45569 8.1 HIGH Roxy-WI: Path-traversal patch in commit d4d10006 is a no-op (tuple-membership bug)
CVE-2026-45565 8.1 HIGH Roxy-WI: EscapedString validator skips its '..' block when stripping (root cause for sever
CVE-2026-45561 6.5 MEDIUM Roxy-WI: SSRF in /smon/agent/<endpoint>/<server_ip> reachable to cloud metadata IPs
CVE-2026-45566 6.1 MEDIUM Roxy-WI: Open redirect on /login?next= via basic-auth userinfo syntax bypass
CVE-2026-45560 6.1 MEDIUM Roxy-WI: Stored XSS in log viewer (wrap_line/highlight_word produce unescaped HTML)
CVE-2026-45559 4.9 MEDIUM Roxy-WI: LDAP injection in /user/ldap/<username> (admin-only)
CVE-2026-45563 4.3 MEDIUM Roxy-WI: IDOR — any authenticated user can read another user's full action history

IV. Related Vulnerabilities

Same product: roxy-wi
Same vendor: roxy-wi
Same weakness: CWE-20

V. Comments for CVE-2026-45556

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