Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/showdownjs/showdown
- https://github.com/showdownjs/showdown/commit/e5cab1e9a5dcea2bb3cbf888863fa7e65a
- https://github.com/showdownjs/showdown/issues/1046
- https://www.vulncheck.com/advisories/showdown-stored-xss-via-unescaped-table-hea
- https://github.com/showdownjs/showdown/issues/1046
FAQ
What is CVE-2026-59710?
CVE-2026-59710 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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 ...
How severe is CVE-2026-59710?
CVE-2026-59710 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-59710?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.