Medium, CVSS 5.1GoPublished
goldmark vulnerable to Cross-site Scripting (XSS)
CVE-2026-5160 · GHSA-c97m-vxhj-p7j6
- Affected
- Go github.com/yuin/goldmark/renderer/html < 1.7.17
- Fixed in
- 1.7.17· Vendor fix available
- Issue
- 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.
Recommended action: Upgrade to 1.7.17 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.