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4 vulnerabilities found for showdown by showdown
CVE-2026-59710 (GCVE-0-2026-59710)
Vulnerability from nvd – Published: 2026-07-06 21:15 – Updated: 2026-07-07 13:47
VLAI
EPSS
VEX
Title
showdown - Stored XSS via Unescaped Table Header ID Attribute Injection
Summary
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.
Severity
6.1 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/showdownjs/showdown/issues/1046 | issue-tracking |
| https://github.com/showdownjs/showdown | product |
| https://github.com/showdownjs/showdown/commit/e5c… | patch |
| https://www.vulncheck.com/advisories/showdown-sto… | third-party-advisory |
Date Public
2026-03-12 00:00
Credits
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CVE-2026-59711 (GCVE-0-2026-59711)
Vulnerability from nvd – Published: 2026-07-06 21:00 – Updated: 2026-07-07 14:06
VLAI
EPSS
VEX
Title
showdown - Cross-Site Scripting via Unescaped Metadata Title in completeHTMLDocument
Summary
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.
Severity
6.1 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/showdownjs/showdown/issues/1047 | issue-tracking |
| https://github.com/showdownjs/showdown | product |
| https://www.vulncheck.com/advisories/showdown-cro… | third-party-advisory |
Date Public
2026-03-12 00:00
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CVE-2026-59710 (GCVE-0-2026-59710)
Vulnerability from cvelistv5 – Published: 2026-07-06 21:15 – Updated: 2026-07-07 13:47
VLAI
EPSS
VEX
Title
showdown - Stored XSS via Unescaped Table Header ID Attribute Injection
Summary
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.
Severity
6.1 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/showdownjs/showdown/issues/1046 | issue-tracking |
| https://github.com/showdownjs/showdown | product |
| https://github.com/showdownjs/showdown/commit/e5c… | patch |
| https://www.vulncheck.com/advisories/showdown-sto… | third-party-advisory |
Date Public
2026-03-12 00:00
Credits
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CVE-2026-59711 (GCVE-0-2026-59711)
Vulnerability from cvelistv5 – Published: 2026-07-06 21:00 – Updated: 2026-07-07 14:06
VLAI
EPSS
VEX
Title
showdown - Cross-Site Scripting via Unescaped Metadata Title in completeHTMLDocument
Summary
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.
Severity
6.1 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/showdownjs/showdown/issues/1047 | issue-tracking |
| https://github.com/showdownjs/showdown | product |
| https://www.vulncheck.com/advisories/showdown-cro… | third-party-advisory |
Date Public
2026-03-12 00:00
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}
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],
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{
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"value": "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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"Recovery": "NOT_DEFINED",
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}
],
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{
"descriptions": [
{
"cweId": "CWE-79",
"description": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
"lang": "en",
"type": "CWE"
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]
}
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"dateUpdated": "2026-07-07T13:48:12.383Z",
"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"shortName": "VulnCheck"
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"name": "GitHub Issue",
"tags": [
"issue-tracking"
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"url": "https://github.com/showdownjs/showdown/issues/1047"
},
{
"name": "Product",
"tags": [
"product"
],
"url": "https://github.com/showdownjs/showdown"
},
{
"tags": [
"third-party-advisory"
],
"url": "https://www.vulncheck.com/advisories/showdown-cross-site-scripting-via-unescaped-metadata-title-in-completehtmldocument"
}
],
"title": "showdown - Cross-Site Scripting via Unescaped Metadata Title in completeHTMLDocument",
"x_generator": {
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}
}
},
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"datePublished": "2026-07-06T21:00:38.491Z",
"dateReserved": "2026-07-06T15:31:46.188Z",
"dateUpdated": "2026-07-07T14:06:55.895Z",
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