[ CVE-2026-104477 · Published 3 Oct 2026 ]
Vulnerability in showdownjs showdown
CVSS 6.1
EPSS <1%No fix listed yet
[ Description ]Official 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.
[ Fixes ]Fixes and patches
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.