{"schema_version":"1.9.0","id":"GHSA-c97m-vxhj-p7j6","published":"2026-04-17T15:31:17Z","modified":"2026-09-10T03:50:43.784301907Z","aliases":["CVE-2026-5160","GO-2026-5320"],"summary":"goldmark vulnerable to Cross-site Scripting (XSS)","details":"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":[{"package":{"name":"github.com/yuin/goldmark/renderer/html","ecosystem":"Go","purl":"pkg:golang/github.com/yuin/goldmark/renderer/html"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.7.17"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-c97m-vxhj-p7j6/GHSA-c97m-vxhj-p7j6.json"}}],"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5160"},{"type":"WEB","url":"https://github.com/yuin/goldmark/commit/cb46bbc4eca29d55aa9721e04ad207c23ccc44f9"},{"type":"PACKAGE","url":"https://github.com/yuin/goldmark"},{"type":"WEB","url":"https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMYUINGOLDMARKRENDERERHTML-15838406"}],"database_specific":{"cwe_ids":["CWE-79"],"github_reviewed":true,"github_reviewed_at":"2026-04-18T01:02:42Z","nvd_published_at":"2026-04-15T06:16:13Z","severity":"MODERATE"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N"}]}