Is CVE-2026-59710 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-59710?

CVE-2026-59710 has a CVSS v3 severity of MEDIUM (6.1).

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CVE-2026-59710

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.