{"id":"CVE-2026-5160","state":"PUBLISHED","title":"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 normalizati","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.","publishedAt":"2026-04-15T05:00:01.655Z","updatedAt":"2026-04-15T18:07:10.025Z","severity":{"score":5.1,"label":"Medium","version":"4.0","vector":"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","source":"snyk"},"assigner":"snyk","products":["n/a github.com/yuin/goldmark/renderer/html"],"affected":[{"vendor":"n/a","product":"github.com/yuin/goldmark/renderer/html","versions":[{"version":"0","status":"affected","lessThan":"1.7.17","versionType":"semver"}]}],"references":["https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMYUINGOLDMARKRENDERERHTML-15838406","https://github.com/yuin/goldmark/commit/cb46bbc4eca29d55aa9721e04ad207c23ccc44f9"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/5xxx/CVE-2026-5160.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-5160","state":"PUBLISHED","datePublished":"2026-04-15T05:00:01.655Z","dateUpdated":"2026-04-15T18:07:10.025Z","assignerShortName":"snyk","assignerOrgId":"bae035ff-b466-4ff4-94d0-fc9efd9e1730","dateReserved":"2026-03-30T14:14:48.647Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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":[{"vendor":"n/a","product":"github.com/yuin/goldmark/renderer/html","versions":[{"version":"0","status":"affected","lessThan":"1.7.17","versionType":"semver"}]}],"references":[{"url":"https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMYUINGOLDMARKRENDERERHTML-15838406"},{"url":"https://github.com/yuin/goldmark/commit/cb46bbc4eca29d55aa9721e04ad207c23ccc44f9"}],"metrics":[{"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","exploitCodeMaturity":"NOT_DEFINED","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"cvssV4_0":{"version":"4.0","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","baseScore":5.1,"baseSeverity":"MEDIUM","vectorString":"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","description":"Cross-site Scripting (XSS)","lang":"en"}]}],"providerMetadata":{"shortName":"snyk","orgId":"bae035ff-b466-4ff4-94d0-fc9efd9e1730","dateUpdated":"2026-04-15T05:00:01.655Z"},"credits":[{"value":"Catalin Iovita (Snyk Security Research)","lang":"en"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-15T18:07:02.033634Z","id":"CVE-2026-5160","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-15T18:07:10.025Z"}}]}}}