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CVE-2026-104477

Showdown through 2.1.0 XSS via unescaped quote in href and src attributes

CVSS 4.0 5.3 MEDIUMCVSS 3.1 6.1 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-104477

Published

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 onmouseover handlers to execute script when victims view rendered HTML.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-104477

Published

showdown

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "showdownjs",
                    "product": "showdown",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:npm/showdown",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThanOrEqual": "2.1.0"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON