EUVD-2026-22836
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
2DescriptionNVD
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.
AnalysisAI
Cross-site scripting (XSS) in goldmark HTML renderer before version 1.7.17 allows unauthenticated remote attackers to execute arbitrary JavaScript by encoding dangerous URL schemes (such as javascript:) using HTML5 named character references, bypassing the renderer's prefix-based protocol validation due to improper ordering of entity resolution. Applications using affected versions can be exploited via crafted markdown containing malicious links that render unsafe protocols in user contexts, with a CVSS score of 6.1 indicating moderate real-world impact driven by the requirement for user interaction (UI:R) and change of scope across trust boundaries.
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