{"identifier":"CVE-2026-42091","cve":{"id":"CVE-2026-42091","description":"goshs is a SimpleHTTPServer written in Go. Prior to version 2.0.2, the PUT upload handler (httpserver/updown.go) lacks the CSRF token validation that was added to the POST upload handler during the CVE-2026-40883 fix. Combined with the unconditional Access-Control-Allow-Origin: * on the OPTIONS preflight handler (httpserver/server.go), any website can write arbitrary files to a goshs instance through the victim's browser — bypassing network isolation (e.g. localhost, internal network). This issue has been patched in version 2.0.2.","published":"2026-05-04T18:16:31.210000+00:00","modified":"2026-10-26T19:10:00.163000+00:00","status":"Analyzed","score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","cvss_version":"3.1","affected":[{"criteria":"cpe:2.3:a:goshs:goshs:*:*:*:*:*:go:*:*","versionStartIncluding":"","versionStartExcluding":"","versionEndIncluding":"","versionEndExcluding":"2.0.2"}],"weaknesses":["CWE-352"],"references":[{"url":"https://github.com/patrickhener/goshs/commit/0e715b94e10c3d1aa552276000f15f104dee2f32","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/patrickhener/goshs/releases/tag/v2.0.2","source":"security-advisories@github.com","tags":["Product","Release Notes"]},{"url":"https://github.com/patrickhener/goshs/security/advisories/GHSA-rhf7-wvw3-vjvm","source":"security-advisories@github.com","tags":["Exploit","Vendor Advisory"]},{"url":"https://github.com/patrickhener/goshs/security/advisories/GHSA-rhf7-wvw3-vjvm","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":["Exploit","Vendor Advisory"]}],"kev":null,"kev_checked":true,"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-05-05T13:07:28.351435Z","id":"CVE-2026-42091","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:goshs:goshs:*:*:*:*:*:go:*:*","versionEndExcluding":"2.0.2","matchCriteriaId":"D83E7458-F091-489A-9C7A-2189CF452680"}]}]}],"source":"nvd","retrieved_at":"2026-10-28T10:19:58.252658+00:00","exploited":false,"kev_stale":false,"products":["goshs / goshs"],"priority":{"label":"Assess exposure and vendor guidance","reasons":["No higher-priority signal is available in the current stored evidence."]},"epss":{"probability":0.00165,"percentile":0.05673,"date":"2026-10-28","stale":false},"version_assessment":null},"news":[],"campaigns":[],"domains":[{"domain":"github.com","source_url":"https://github.com/patrickhener/goshs/commit/0e715b94e10c3d1aa552276000f15f104dee2f32","investigate_url":"https://investigate.aeglixmind.com/#github.com"}],"arsenal_url":"https://arsenal.aeglixmind.com/?cve=CVE-2026-42091","catalog_url":"https://cves.aeglixmind.com/cve/CVE-2026-42091","research_url":"https://investigate.aeglixmind.com/research/cve/CVE-2026-42091","coverage":{"news_candidates_checked":0,"campaign_candidates_checked":0,"bounded":false,"notice":"Exact CVE mentions in stored public excerpts and reviewed campaign content only. A mention is not proof of exploitation, attribution or tool suitability. Missing matches do not establish absence."}}