CVE-2026-59710

mediumCVSS 6.1covered by 1 sourcefirst seen 2026-07-06

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.

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Exploitation outlook

Low exploitation risk0.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-59710: showdown contains a stored cross-site scripting vulnerability in the parseHeaders function of …nvd · 2026-07-06

External references

NVD record for CVE-2026-59710

CVE.org record

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