{"id":"CVE-2026-89259","state":"PUBLISHED","title":"Hugo before v0.165.0 Insufficient Permission Restriction via TailwindCSS","description":"Hugo is a static site generator. From v0.161.0, Hugo executes Node tools under Node's permission model, but TailwindCSS — included in the default security.exec.allow list — requires a highly permissive configuration (--allow-addons, --allow-child-process, --allow-worker). As a result, the restrictions intended by the fix for GHSA-x597-9fr4-5857 could still be bypassed, allowing a Node tool invoked during a build to read and write files outside the project's working directory. Affected versions are those after v0.43; the issue was fixed in v0.165.0 by removing tailwindcss from the default security.exec.allow list. Users who do not use TailwindCSS, or who only build trusted sites, are not affected. As a workaround, users can define a restrictive security.exec.allow list in hugo.toml.","publishedAt":"2026-09-11T11:15:35.062Z","updatedAt":"2026-09-11T20:29:43.170Z","severity":{"score":9.3,"label":"Critical","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["gohugoio hugo"],"affected":[{"vendor":"gohugoio","product":"hugo","packageURL":"pkg:golang/github.com/gohugoio/hugo","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.165.0","versionType":"semver"},{"version":"0.165.0","status":"unaffected","versionType":"semver"}]}],"references":["https://github.com/gohugoio/hugo/security/advisories/GHSA-vrm6-x8vp-mv2r","https://www.vulncheck.com/advisories/hugo-before-0.165.0-insufficient-permission-restriction-via-tailwindcss"],"weaknesses":["CWE-250"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89259.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89259","state":"PUBLISHED","datePublished":"2026-09-11T11:15:35.062Z","dateUpdated":"2026-09-11T20:29:43.170Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-09-11T10:52:56.668Z"},"containers":{"cna":{"title":"Hugo before v0.165.0 Insufficient Permission Restriction via TailwindCSS","descriptions":[{"lang":"en","value":"Hugo is a static site generator. From v0.161.0, Hugo executes Node tools under Node's permission model, but TailwindCSS — included in the default security.exec.allow list — requires a highly permissive configuration (--allow-addons, --allow-child-process, --allow-worker). As a result, the restrictions intended by the fix for GHSA-x597-9fr4-5857 could still be bypassed, allowing a Node tool invoked during a build to read and write files outside the project's working directory. Affected versions are those after v0.43; the issue was fixed in v0.165.0 by removing tailwindcss from the default security.exec.allow list. Users who do not use TailwindCSS, or who only build trusted sites, are not affected. As a workaround, users can define a restrictive security.exec.allow list in hugo.toml."}],"affected":[{"vendor":"gohugoio","product":"hugo","packageURL":"pkg:golang/github.com/gohugoio/hugo","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.165.0","versionType":"semver"},{"version":"0.165.0","status":"unaffected","versionType":"semver"}]}],"references":[{"url":"https://github.com/gohugoio/hugo/security/advisories/GHSA-vrm6-x8vp-mv2r","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-vrm6-x8vp-mv2r)"},{"url":"https://www.vulncheck.com/advisories/hugo-before-0.165.0-insufficient-permission-restriction-via-tailwindcss","name":"VulnCheck Advisory: Hugo before v0.165.0 Insufficient Permission Restriction via TailwindCSS","tags":["third-party-advisory"]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":9.3,"baseSeverity":"CRITICAL","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS"},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-250","lang":"en","description":"Execution with Unnecessary Privileges","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-09-11T11:15:35.062Z"},"datePublic":"2026-08-27T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:gohugo:hugo:*:*:*:*:*:*:*:*","versionEndExcluding":"0.165.0"}]}]}],"credits":[{"lang":"en","value":"mtholmquist","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-11T17:11:14.920833Z","id":"CVE-2026-89259","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-11T20:29:43.170Z"}}]}}}