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CVE-2026-56661— GetSimple CMS: Server-Side Request Forgery in the UpdateCE update endpoint

Quick assessment

Affected
GetSimpleCMS-CE GetSimpleCMS-CE
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.

GetSimple CMS 是一款内容管理系统（CMS），而 GetSimple CMS CE 是该系统的社区版。在 1.5 版本之前，更新处理程序仅对用户提供 URL 进行格式验证（使用 FILTER_VALIDATE_URL），随后便通过 file_get_contents() 函数发起请求，而未对请求目标进行任何安全校验。因此，能够提交该表单的攻击者可以诱导服务器向任意目的地发起请求，包括仅限内部访问的服务以及云元数据端点（如 169.254.169.254）。此外，获取到的响应体被写入一个可通过 Web 访

CVSS 7.5 · High EPSS 0.26% · P17

Affected Version Matrix 1

VendorProduct Version RangeStatus
GetSimpleCMS-CE GetSimpleCMS-CE < 1.5 affected
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I. Basic Information for CVE-2026-56661

Vulnerability Information
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Vulnerability Title
GetSimple CMS: Server-Side Request Forgery in the UpdateCE update endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
GetSimple CMS is a content management system (CMS), and GetSimple CMS CE is the community edition of that CMS. Prior to version 1.5, the update handler fetches a user-supplied URL with file_get_contents() after only format validation (FILTER_VALIDATE_URL) — there is no validation of the request destination. An attacker who can submit the form can make the server issue requests to arbitrary destinations, including internal-only services and cloud metadata endpoints (169.254.169.254). The fetched response body is written to a web-accessible file (/Tmpfile.zip) and is not deleted when the content is not a valid ZIP, turning this into a full-read SSRF: the attacker can retrieve the response of the internal request directly. This issue has been patched in version 1.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
GetSimpleCMS-CE GetSimpleCMS-CE < 1.5 -

II. Public POCs for CVE-2026-56661

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III. Intelligence Information for CVE-2026-56661

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Vendor Advisories for CVE-2026-56661 (1)

Same Patch Batch · GetSimpleCMS-CE · 2026-10-01 · 7 CVEs total

CVE-2026-56662 9.6 CRITICAL GetSimple CMS: Missing CSRF protection in UpdateCE allows forging a privileged server-side
CVE-2026-53953 9.1 CRITICAL GetSimple CMS: Predictable Password Reset Password Allows Administrator Account Takeover
CVE-2026-56660 9.1 CRITICAL GetSimple CMS: CSRF, SSRF, and Unrestricted Zip Extraction
CVE-2026-70650 8.8 HIGH GetSimple CMS: Authenticated Stored XSS in backup viewer (backup-edit.php) via output deco
CVE-2026-71542 8.7 HIGH GetSimple CMS: Stored Cross-Site Scripting (XSS) via the "title" parameter in admin/compon
CVE-2026-71426 7.1 HIGH GetSimple CMS: Authenticated Stored Local File Inclusion (LFI) via page "template" field

IV. Related Vulnerabilities

Same product: GetSimpleCMS-CE
Same vendor: GetSimpleCMS-CE
Same weakness: CWE-918

V. Comments for CVE-2026-56661

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