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CVE-2026-89145— Flextype CMS 0.9.9 through 1.0.0-alpha.3 Stored XSS via Plugin Directory

Quick assessment

Affected
flextype flextype
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.

Flextype是Flextype组织的一款内容管理系统。 Flextype 0.9.9版本至1.0.0-alpha.3版本存在跨站脚本漏洞，该漏洞源于getValidPluginsDependencies()渲染的依赖错误页面未对插件目录名进行HTML转义，具有插件目录写入权限的攻击者可创建名称含HTML字符的插件，在依赖验证失败时于用户浏览器中执行任意脚本。

CVSS 4.2 · Medium EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
flextype flextype 0.9.9≤ 1.0.0-alpha.3 affected
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I. Basic Information for CVE-2026-89145

Vulnerability Information
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Vulnerability Title
Flextype CMS 0.9.9 through 1.0.0-alpha.3 Stored XSS via Plugin Directory
Source: CVE Program / CVE List V5
Vulnerability Description
Flextype CMS versions 0.9.9 through 1.0.0-alpha.3 fail to HTML-escape plugin directory names in the dependency error page rendered by getValidPluginsDependencies(). Attackers with write access to the plugins directory can create a plugin with HTML characters in its name to execute arbitrary scripts in users' browsers when dependency validation fails.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A: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
Vulnerability Title
Flextype 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Flextype是Flextype组织的一款内容管理系统。 Flextype 0.9.9版本至1.0.0-alpha.3版本存在跨站脚本漏洞，该漏洞源于getValidPluginsDependencies()渲染的依赖错误页面未对插件目录名进行HTML转义，具有插件目录写入权限的攻击者可创建名称含HTML字符的插件，在依赖验证失败时于用户浏览器中执行任意脚本。
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
flextype flextype 0.9.9 ~ 1.0.0-alpha.3 -

II. Public POCs for CVE-2026-89145

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III. Intelligence Information for CVE-2026-89145

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Patches & Fixes for CVE-2026-89145 (1)

Vendor Advisories for CVE-2026-89145 (2)

Proof of Concept for CVE-2026-89145 (1)

IV. Related Vulnerabilities

Same product: flextype
Same vendor: flextype
Same weakness: CWE-79

V. Comments for CVE-2026-89145

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