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CVE-2026-104477— Showdown through 2.1.0 XSS via unescaped quote in href and src attributes

Quick assessment

Affected
showdownjs 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.

Showdown 2.1.0 及之前版本在 链接和图像子解析器中存在跨站脚本（XSS）漏洞。这些子解析器未对目标 URL 中的双引号进行转义，当这些 URL 被嵌入到 和 属性时，便会产生安全风险。攻击者可构造包含双引号后紧跟 或 事件处理程序的 Markdown 链接或图像语法，当受害者查看渲染后的 HTML 内容时，即可执行恶意脚本。

CVSS 6.1 · Medium EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
showdownjs showdown ≤ 2.1.0 affected
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I. Basic Information for CVE-2026-104477

Vulnerability Information
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Vulnerability Title
Showdown through 2.1.0 XSS via unescaped quote in href and src attributes
Source: CVE Program / CVE List V5
Vulnerability Description
Showdown through 2.1.0 contains a cross-site scripting vulnerability in the makehtml link and image subparsers, which fail to escape double quotes in destination URLs placed into href and src attributes. Attackers can craft markdown links or images containing a double quote followed by onerror or onmouseover handlers to execute script when victims view rendered HTML.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
showdownjs showdown 0 ~ 2.1.0 -

II. Public POCs for CVE-2026-104477

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-104477

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Patches & Fixes for CVE-2026-104477 (1)

Vendor Advisories for CVE-2026-104477 (1)

Other References for CVE-2026-104477 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-104477

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