CVE-2026-59711

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

showdown contains a cross-site scripting vulnerability in metadata title handling that allows attackers to inject arbitrary HTML and JavaScript. When completeHTMLDocument option is enabled, unescaped less-than and greater-than characters in markdown frontmatter metadata are inserted directly into HTML title tags, enabling attackers to break out of the title context and execute malicious scripts in the rendered page.

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Exploitation outlook

Low exploitation risk0.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-59711: showdown contains a cross-site scripting vulnerability in metadata title handling that allows …nvd · 2026-07-06

External references

NVD record for CVE-2026-59711

CVE.org record

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