showdown allows stored cross-site scripting through table header ID injection
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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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-59710US | — | — | ||
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 attrib… | ||||
02
references
External citations — patches, advisories, analysis.
- https://github.com/showdownjs/showdownPACKAGE
- https://github.com/showdownjs/showdown/commit/e5cab1e9a5dcea2bb3cbf888863fa7e65ab37edfWEB
- https://github.com/showdownjs/showdown/issues/1046WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-59710ADVISORY
- https://www.vulncheck.com/advisories/showdown-stored-xss-via-unescaped-table-header-id-attribute-injectionWEB
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