CVE-2026-59710
MEDIUM
NVD
CVSS Score
6.1
Severity
MEDIUM
Published
Jul 06, 2026
Vendor
unknown
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.