Cloudanix VulnDB

CVE-2026-5160

Medium · 6.1

CVSS

6.1

EPSS

0.3%

Published

Apr 15, 2026

CISA due date

—

The record

Versions of the package github.com/yuin/goldmark/renderer/html before 1.7.17 are vulnerable to Cross-site Scripting (XSS) due to improper ordering of URL validation and normalization. The renderer validates link destinations using a prefix-based check (IsDangerousURL) before resolving HTML entities. This allows an attacker to bypass protocol filtering by encoding dangerous schemes using HTML5 named character references. For example, a payload such as javascript:alert(1) is not recognized as dangerous during validation, leading to arbitrary script execution in the context of applications that render the URL.

Affected packages

Ecosystem Package Introduced Fixed

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