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CVE-2026-86644— star7th showdoc API Page Save Endpoint editormd.js cross site scripting

Quick assessment

Affected
star7th showdoc
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.

showdoc是showdoc团队开源的一个团队文档在线共享工具。 showdoc 3.9.1及之前版本存在安全漏洞，该漏洞源于API Page Save Endpoint组件的web_src/public/editor.md/editormd.js文件存在未知代码问题，可能导致跨站脚本攻击。

CVSS 3.5 · Low EPSS 0.36% · P30

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 3

VendorProduct Version RangeStatus
star7th showdoc 3.9.0 affected
3.9.1 affected
3.9.2 unaffected
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I. Basic Information for CVE-2026-86644

Vulnerability Information
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Vulnerability Title
star7th showdoc API Page Save Endpoint editormd.js cross site scripting
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was determined in star7th showdoc up to 3.9.1. This vulnerability affects unknown code of the file web_src/public/editor.md/editormd.js of the component API Page Save Endpoint. Executing a manipulation can lead to cross site scripting. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized. Upgrading to version 3.9.2 is able to resolve this issue. This patch is called a8ea1520850b4242f395247f72e87e597506cef0. Upgrading the affected component is recommended. The vendor confirms: "The fix [...] sets Mermaid `securityLevel` to `strict`, disables `htmlLabels`, and sanitizes rendered SVG with DOMPurify."
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/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
showdoc 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
showdoc是showdoc团队开源的一个团队文档在线共享工具。 showdoc 3.9.1及之前版本存在安全漏洞，该漏洞源于API Page Save Endpoint组件的web_src/public/editor.md/editormd.js文件存在未知代码问题，可能导致跨站脚本攻击。
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
star7th showdoc 3.9.0 cpe:2.3:a:showdoc:showdoc:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-86644

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III. Intelligence Information for CVE-2026-86644

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Patches & Fixes for CVE-2026-86644 (1)

Proof of Concept for CVE-2026-86644 (2)

Vendor Pages for CVE-2026-86644 (1)

IV. Related Vulnerabilities

Same product: showdoc
Same vendor: star7th
Same weakness: CWE-79