PT-2026-104459

CVE-2026-104477

Published

2026-10-02

Updated

2026-10-06

Description by

CVSS 3.1

6.1

Medium

MetricsAV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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 create markdown links or images containing a double quote followed by onerror or onmouseover handlers to execute arbitrary scripts when a user views the rendered HTML.

Recommendations Update Showdown to version 2.1.1 or later.

Exploitability

Exploit

Fix

Impacts

Researchers

Muhammad Sobirov

Vendors

Affected products

Weakness enumeration

CWE-79: Improper Neutralization of Input During Web Page Generation (\'Cross-site Scripting\')

Related identifiers