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CVE-2026-6561— EyouCMS Index.php edit_adminlogo unrestricted upload

Quick assessment

Affected
n/a EyouCMS
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.

EyouCMS是中国易优（Eyou）公司的一套基于ThinkPHP的开源内容管理系统（CMS）。 EyouCMS 1.7.1及之前版本存在安全漏洞，该漏洞源于对文件application/admin/controller/Index.php中参数filename的操作，可能导致任意文件上传。

CVSS 4.7 · Medium EPSS 0.38% · P29
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I. Basic Information for CVE-2026-6561

Vulnerability Information
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Vulnerability Title
EyouCMS Index.php edit_adminlogo unrestricted upload
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was detected in EyouCMS up to 1.7.1. This issue affects the function edit_adminlogo of the file application/admin/controller/Index.php. Performing a manipulation of the argument filename results in unrestricted upload. The attack is possible to be carried out remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
EyouCMS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
EyouCMS是中国易优（Eyou）公司的一套基于ThinkPHP的开源内容管理系统（CMS）。 EyouCMS 1.7.1及之前版本存在安全漏洞，该漏洞源于对文件application/admin/controller/Index.php中参数filename的操作，可能导致任意文件上传。
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
- EyouCMS 1.7.0 cpe:2.3:a:eyoucms:eyoucms:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-6561

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: PROOF_395a8a12d7b64eac exfiltrated via edit_adminlogo arbitrary file copy into /public/static/admin/images/logo*.png
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
Upgrade to Pro+
claude_code · 6981 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-6561

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Vendor Advisories for CVE-2026-6561 (1)

Security Blog Posts for CVE-2026-6561 (1)

IV. Related Vulnerabilities

Same product: EyouCMS
Same vendor: n/a
Same weakness: CWE-434

V. Comments for CVE-2026-6561

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