CVE-2026-104477
MEDIUM
NVD
CVSS Score
6.1
Severity
MEDIUM
Published
Oct 03, 2026
Vendor
unknown
Description
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.