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CVE-2026-70650— GetSimple CMS: Authenticated Stored XSS in backup viewer (backup-edit.php) via output decoding of page meta fields and content

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 3.3.22 及更早版本中，页面备份查看器（admin/backup-edit.php）中存在一个经过身份验证的存储型跨站脚本攻击（Stored XSS）漏洞。 当页面保存时，其中的字段会正确地进行 HTML 编码；但备份查看器在显示这些内容时会再次对其进行解码（通过 htmldecode() / strip_decode() 函数），并在未重新转义的情况下直接输出结果。因此，任何能够编辑页面的用户

CVSS 8.8 · High EPSS 0.26% · P16

Affected Version Matrix 1

VendorProduct Version RangeStatus
GetSimpleCMS-CE GetSimpleCMS-CE <= 3.3.22 affected
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I. Basic Information for CVE-2026-70650

Vulnerability Information
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Vulnerability Title
GetSimple CMS: Authenticated Stored XSS in backup viewer (backup-edit.php) via output decoding of page meta fields and content
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. In versions 3.3.22 and prior, an authenticated stored Cross-Site Scripting (XSS) vulnerability exists in the page backup viewer (admin/backup-edit.php). Page fields are correctly HTML-encoded when a page is saved, but the backup viewer decodes them again (htmldecode() / strip_decode()) and prints the result without re-escaping. A user who can edit a page can store JavaScript in a page's Keywords, Description, Menu text or Content; it executes in the browser of any administrator who later views that page's backup, in the context of the admin control panel. At time of publication, there are no publicly available patches.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
GetSimpleCMS-CE GetSimpleCMS-CE <= 3.3.22 -

II. Public POCs for CVE-2026-70650

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III. Intelligence Information for CVE-2026-70650

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Vendor Advisories for CVE-2026-70650 (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-2026-71542 8.7 HIGH GetSimple CMS: Stored Cross-Site Scripting (XSS) via the "title" parameter in admin/compon
CVE-2026-56661 7.5 HIGH GetSimple CMS: Server-Side Request Forgery in the UpdateCE update endpoint
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-79

V. Comments for CVE-2026-70650

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