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CVE-2026-59710— showdown - Stored XSS via Unescaped Table Header ID Attribute Injection

Quick assessment

Affected
showdown showdown
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.

ShowdownJS Showdown是ShowdownJS团队开源的一个 JavaScript Markdown 到 HTML 转换器。 ShowdownJS Showdown 2.1.0及之前版本存在跨站脚本漏洞，该漏洞源于src/subParsers/makehtml/tables.js文件的parseHeaders函数未能正确转义表头ID属性，导致攻击者可通过Markdown表头中的双引号字符注入任意HTML和可执行脚本的SVG元素，在使用默认github flavor配置渲染不受信任的Markd

CVSS 6.1 · Medium EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
showdown showdown ≤ 2.1.0 affected
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I. Basic Information for CVE-2026-59710

Vulnerability Information
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Vulnerability Title
showdown - Stored XSS via Unescaped Table Header ID Attribute Injection
Source: CVE Program / CVE List V5
Vulnerability Description
showdown contains a stored cross-site scripting vulnerability in the parseHeaders function of src/subParsers/makehtml/tables.js that fails to properly escape table header ID attributes. Attackers can inject arbitrary HTML and script-executing SVG elements through double-quote characters in markdown table headers, achieving stored XSS when untrusted markdown is rendered with the default github flavor configuration.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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
ShowdownJS Showdown 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ShowdownJS Showdown是ShowdownJS团队开源的一个 JavaScript Markdown 到 HTML 转换器。 ShowdownJS Showdown 2.1.0及之前版本存在跨站脚本漏洞，该漏洞源于src/subParsers/makehtml/tables.js文件的parseHeaders函数未能正确转义表头ID属性，导致攻击者可通过Markdown表头中的双引号字符注入任意HTML和可执行脚本的SVG元素，在使用默认github flavor配置渲染不受信任的Markd
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
showdown showdown 0 ~ 2.1.0 -

II. Public POCs for CVE-2026-59710

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III. Intelligence Information for CVE-2026-59710

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Patches & Fixes for CVE-2026-59710 (1)

Vendor Advisories for CVE-2026-59710 (2)

Other References for CVE-2026-59710 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-59710

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