CVE-2026-104477

A flaw was found in showdown. The link and image parsers fail to properly sanitize or escape double quotation marks in destination URLs when rendering HTML attributes. A remote attacker could exploit this flaw by supplying crafted Markdown input containing malicious event handlers, leading to...

EUVD-2026-91853

Showdown through 2.1.0 contains a cross-site scripting vulnerability in the makehtml link and image subparsers, which fail to escape double quotes in destination URLs placed into href and src attributes. Attackers can craft markdown links or images containing a double quote followed by onerror or...

Cross-site Scripting (XSS)

Overview showdown is a JavaScript Markdown to HTML converter. Affected versions of this package are vulnerable to Cross-site Scripting XSS via the makehtml.image and makehtml.link sub-parsers, when processing inline links or images whose angle-bracket destination URL contains a double-quote...

CVE-2026-104477

Showdown through 2.1.0 contains a cross-site scripting vulnerability in the makehtml link and image subparsers, which fail to escape double quotes in destination URLs placed into href and src attributes. Attackers can craft markdown links or images containing a double quote followed by onerror or...

CVE-2026-104477: Improper Neutralization of Input During Web Page Generation

Showdown through 2.1.0 contains a cross-site scripting vulnerability in the makehtml link and image subparsers, which fail to escape double quotes in destination URLs placed into href and src attributes. Attackers can craft markdown links or images containing a double quote followed by onerror or...

CVE-2026-104477 Showdown through 2.1.0 XSS via unescaped quote in href and src attributes

Showdown through 2.1.0 contains a cross-site scripting vulnerability in the makehtml link and image subparsers, which fail to escape double quotes in destination URLs placed into href and src attributes. Attackers can craft markdown links or images containing a double quote followed by onerror or...

CVE-2026-104477

The Showdown library (versions through 2.1.0 ) is vulnerable to Cross-Site Scripting (XSS) due to a flaw in the makehtml link and image subparsers. The root cause is the failure to properly sanitize or escape double quotes in destination URLs when rendering HTML attributes like href and src. A re...

CVE-2026-104477 Showdown through 2.1.0 XSS via unescaped quote in href and src attributes

Showdown through 2.1.0 contains a cross-site scripting vulnerability in the makehtml link and image subparsers, which fail to escape double quotes in destination URLs placed into href and src attributes. Attackers can craft markdown links or images containing a double quote followed by onerror or...

CVE-2026-104477 Showdown through 2.1.0 XSS via unescaped quote in href and src attributes

Showdown through 2.1.0 contains a cross-site scripting vulnerability in the makehtml link and image subparsers, which fail to escape double quotes in destination URLs placed into href and src attributes. Attackers can craft markdown links or images containing a double quote followed by onerror or...

PT-2026-104459

Name of the Vulnerable Software and Affected Versions Showdown versions prior to 2.1.1 Description Cross-site scripting occurs in the makehtml link and image subparsers due to a failure to escape double quotes in destination URLs used within href and src attributes. This allows attackers to creat...

CVE-2026-59710

A flaw was found in Showdown. This vulnerability, a stored cross-site scripting XSS issue, allows an attacker to inject malicious code into web pages. By exploiting unescaped table header ID attributes in markdown, an attacker can embed arbitrary HTML and script-executing elements. When untrusted...

CVE-2026-59711

A flaw was found in showdown. This cross-site scripting XSS vulnerability occurs in the metadata title handling when the completeHTMLDocument option is enabled. An attacker can exploit this by injecting unescaped less-than and greater-than characters into markdown frontmatter metadata. This allow...

com.github.linyuzai:concept-plugin-spring-boot-starter (>=2.0.0, <=3.0.0), org.webjars.npm:github-com-showdownjs-ng-showdown (1.1.0) +3 more potentially affected by CVE-2026-59710 via org.webjars.npm:showdown (>=1.9.1, <=2.1.0)

org.webjars.npm:showdown MAVEN version =1.9.1, =2.0.0, =1.0.2, =1.0.3 - org.webjars.npm:showdown-prism 0.2.0 Source cves: CVE-2026-59710 Source advisory: SNYK:JAVA-ORGWEBJARSNPM-17874451...

Cross-site Scripting (XSS)

Overview showdown is a JavaScript Markdown to HTML converter. Affected versions of this package are vulnerable to Cross-site Scripting XSS in the parseHeaders function. An attacker can execute arbitrary scripts in the context of users viewing rendered markdown by injecting specially crafted table...

20mk-utils (>=1.0.0, <=1.0.3), 2d-spirograph (>=1.0.2, <=1.0.4) +2083 more potentially affected by CVE-2026-59710 via showdown (>=0.0.1, <=2.1.0)

showdown NPM version =0.0.1, =1.0.0, =1.0.2, =2.0.4, =1.0.6, =13.351.0, =13.351.0, =7.10.0, =7.10.0, =0.0.3, =1.0.0, =0.0.1, =0.0.39 and more Source cves: CVE-2026-59710 Source advisory: SNYK:JS-SHOWDOWN-17874450...

Cross-site Scripting (XSS)

Overview org.webjars.npm:showdown is a JavaScript Markdown to HTML converter. Affected versions of this package are vulnerable to Cross-site Scripting XSS in the parseHeaders function. An attacker can execute arbitrary scripts in the context of users viewing rendered markdown by injecting special...

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 markdo...

3dmol (>=2.0.4, <=2.0.5), 6_modulojs (1.0.0) +753 more potentially affected by CVE-2026-59710 via showdown (>=2.0.1, <=2.1.0)

showdown NPM version =2.0.1, =2.0.4, =13.351.0, =13.351.0, =7.10.0, =7.10.0, =0.0.3, =0.0.1, =0.0.1-alpha.10, =5.2.20, =0.0.28, =3.1.0 and more Source cves: CVE-2026-59710 Source advisory: OSV:GHSA-22G5-R2X5-97CX...

3dmol (>=2.0.4, <=2.0.5), 6_modulojs (1.0.0) +753 more potentially affected by CVE-2026-59710 via showdown (>=2.0.1, <=2.1.0)

showdown NPM version =2.0.1, =2.0.4, =13.351.0, =13.351.0, =7.10.0, =7.10.0, =0.0.3, =0.0.1, =0.0.1-alpha.10, =5.2.20, =0.0.28, =3.1.0 and more Source cves: CVE-2026-59710 Source advisory: GHSA-22G5-R2X5-97CX...

20mk-utils (>=1.0.0, <=1.0.3), 2d-spirograph (>=1.0.2, <=1.0.4) +2083 more potentially affected by CVE-2026-59711 via showdown (>=0.0.1, <=2.1.0)

showdown NPM version =0.0.1, =1.0.0, =1.0.2, =2.0.4, =1.0.6, =13.351.0, =13.351.0, =7.10.0, =7.10.0, =0.0.3, =1.0.0, =0.0.1, =0.0.39 and more Source cves: CVE-2026-59711 Source advisory: SNYK:JS-SHOWDOWN-17874448...