6.1
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MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Description
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.
Basic Information
ID
CVE-2026-5160
Source
snyk
Published
Apr 15, 2026 at 05:00
Affected Product
Vendor
n/a
Product
github.com/yuin/goldmark/renderer/html
Affected Versions
n/a github.com/yuin/goldmark/renderer/html 0