yuin goldmark up to 1.7.16 URL Validation cross site scripting

Summaryinfo

A vulnerability marked as problematic has been reported in yuin goldmark up to 1.7.16. This issue affects some unknown processing of the component URL Validation Handler. Performing a manipulation results in cross site scripting. This vulnerability is cataloged as CVE-2026-5160. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in yuin goldmark up to 1.7.16. This affects an unknown code of the component URL Validation Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

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.

The advisory is shared at security.snyk.io. This vulnerability is uniquely identified as CVE-2026-5160 since 03/30/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 306637 (Linux Distros Unpatched Vulnerability : CVE-2026-5160), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.7.17 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (306637). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• yuin

Name

• goldmark

Version

• 1.7.0
• 1.7.1
• 1.7.2
• 1.7.3
• 1.7.4
• 1.7.5
• 1.7.6
• 1.7.7
• 1.7.8
• 1.7.9
• 1.7.10
• 1.7.11
• 1.7.12
• 1.7.13
• 1.7.14
• 1.7.15
• 1.7.16

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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