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CVE-2026-59710

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 5.3 · Medium · EPSS 0.3%

Published
Updated

Stack: node

Affected products and versions

  • showdown

    Versions
    • ≥ 0, ≤ 2.1.0: Affected (semver)

    No fix published

  • showdown npm

    Affected ranges
    • SEMVER: ≤ 2.1.0

    No fix published

Original sources

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