# CVE-2026-59710

> 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:** 6.1 (MEDIUM)
- **EPSS:** 0.2%
- **CWE:** CWE-79

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-59710
Full threat coverage + IOCs via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp