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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.

在 star7th 的 ShowDoc 软件中（版本至 3.9.1）发现了一个漏洞。该漏洞影响的是 文件中 API 页面保存端点的相关代码。通过特定操作可触发跨站脚本（XSS）攻击。该攻击可远程发起。此漏洞的利用方式已公开披露，可能被利用。将版本升级到 3.9.2 可解决该问题。该修复对应的补丁编号为 。建议升级受影响的组件。供应商确认：“修复方案 [...] 将 Mermaid 的 设置为 ，禁用 ，并使用 DOMPurify 对渲染后的 SVG 进行净化处理。”

CVSS 3.5 · Low

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

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

V. Comments for CVE-2026-86644

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