PT-2026-104459 · Showdownjs · Showdown

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CVE-2026-104477

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Published

2026-10-02

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Updated

2026-10-03

CVSS v3.1

6.1

Medium

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

Fix

XSS

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Weakness Enumeration

Related Identifiers

CVE-2026-104477

Affected Products

Showdown