VULNERABILITY INTELLIGENCE
CVE-2026-59710
CVSS score6.1 MEDIUM
EPSS probability0.34%
CISA KEVNot currently listed
Published2026-07-06
Last modified2026-07-07
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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.
Weakness classification
- disclosure@vulncheck.com: CWE-79