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showdown - Stored XSS via Unescaped Table Header ID Attribute Injection

CVSS 4.0 5.3 MEDIUMCVSS 3.1 6.1 MEDIUMEUVD CVSS 4.0 5.3 CVSS 4.0 · [email protected] · Secondary 5.3 MEDIUMCVSS 3.1 · [email protected] · Secondary 6.1 MEDIUMCVSS_V3 CVSS_V4 Publisher rating MODERATECheck source for fixed versionsKEV status unknown

cve-program · CVE-2026-59710

Published

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.

Read the publisher's advisory

euvd · EUVD-2026-41954

Published

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.

Read the publisher's advisory

nvd · CVE-2026-59710

Published

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.

Read the publisher's advisory

osv · GHSA-22g5-r2x5-97cx

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

Exploitation and risk

Source status

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Risk history

Compare earlier KEV listings and daily EPSS scores. Advisory wording and affected versions have a separate history.

When does an EPSS score appear as a change?

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Advisory history

13 saved versions

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15 Nov 2026 16:47:57 UTC

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-executi…

euvd · EUVD-2026-41954 · Published

13 Nov 2026 16:02:26 UTC

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-executi…

euvd · EUVD-2026-41954 · Published

11 Nov 2026 15:01:24 UTC

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-executi…

euvd · EUVD-2026-41954 · Published

9 Nov 2026 14:07:44 UTC

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-executi…

euvd · EUVD-2026-41954 · Published

7 Nov 2026 13:25:09 UTC

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-executi…

euvd · EUVD-2026-41954 · Published

5 Nov 2026 12:42:10 UTC

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-executi…

euvd · EUVD-2026-41954 · Published

3 Nov 2026 12:00:58 UTC

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-executi…

euvd · EUVD-2026-41954 · Published

1 Nov 2026 11:24:02 UTC

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-executi…

euvd · EUVD-2026-41954 · Published

30 Oct 2026 10:51:12 UTC

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-executi…

euvd · EUVD-2026-41954 · Published

28 Oct 2026 08:37:26 UTC

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-executi…

euvd · EUVD-2026-41954 · Published

25 Oct 2026 14:19:22 UTC

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-executi…

nvd · CVE-2026-59710 · Published

24 Oct 2026 13:17:17 UTC

showdown allows stored cross-site scripting through table header ID injection

osv · GHSA-22g5-r2x5-97cx · Published

23 Oct 2026 15:48:27 UTC

showdown - Stored XSS via Unescaped Table Header ID Attribute Injection

cve-program · CVE-2026-59710 · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 15 Nov 21:13 UTC · 254 of 275 readable · 250 fully read · documentation 469/469 current