{"id":"CVE-2026-110628","state":"PUBLISHED","title":"Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment","description":"Kan 0.5.5 through 0.6.0 contains an unauthenticated server-side request forgery vulnerability in the /api/download/attatchment route due to an incomplete fix for CVE-2026-32255. When S3_ENDPOINT is unset, attackers can pass arbitrary url query parameters to fetch() to read internal services, localhost ports, and cloud instance metadata.","publishedAt":"2026-10-14T14:17:03.232Z","updatedAt":"2026-10-16T17:16:01.554Z","severity":{"score":9.2,"label":"Critical","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["kanbn kan"],"affected":[{"vendor":"kanbn","product":"kan","packageURL":"pkg:github/kanbn/kan","defaultStatus":"unaffected","versions":[{"version":"0.5.5","status":"affected","lessThanOrEqual":"0.6.0","versionType":"semver"}],"collectionURL":"https://github.com","repo":"https://github.com/kanbn/kan"}],"references":["https://hackmd.io/@leediay/HyIxU63ofg","https://github.com/kanbn/kan/pull/590","https://github.com/kanbn/kan/blob/v0.6.0/apps/web/src/pages/api/download/attatchment.ts#L21-L52","https://github.com/kanbn/kan/blob/v0.6.0/.env.example#L25-L27","https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg","https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7","https://github.com/kanbn/kan","https://www.vulncheck.com/advisories/kan-0.5.5-through-0.6.0-unauthenticated-ssrf-via-api-download-attatchment"],"weaknesses":["CWE-918"],"ingestedAt":"2026-10-29T20:10:33.477Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/110xxx/CVE-2026-110628.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-110628","state":"PUBLISHED","datePublished":"2026-10-14T14:17:03.232Z","dateUpdated":"2026-10-16T17:16:01.554Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-14T13:07:29.410Z"},"containers":{"cna":{"title":"Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment","descriptions":[{"lang":"en","value":"Kan 0.5.5 through 0.6.0 contains an unauthenticated server-side request forgery vulnerability in the /api/download/attatchment route due to an incomplete fix for CVE-2026-32255. When S3_ENDPOINT is unset, attackers can pass arbitrary url query parameters to fetch() to read internal services, localhost ports, and cloud instance metadata."}],"affected":[{"vendor":"kanbn","product":"kan","packageURL":"pkg:github/kanbn/kan","defaultStatus":"unaffected","versions":[{"version":"0.5.5","status":"affected","lessThanOrEqual":"0.6.0","versionType":"semver"}],"collectionURL":"https://github.com","repo":"https://github.com/kanbn/kan"}],"references":[{"url":"https://hackmd.io/@leediay/HyIxU63ofg","tags":["third-party-advisory"]},{"url":"https://github.com/kanbn/kan/pull/590","tags":["issue-tracking","patch"],"name":"Open PR describing the S3_ENDPOINT-unset bypass"},{"url":"https://github.com/kanbn/kan/blob/v0.6.0/apps/web/src/pages/api/download/attatchment.ts#L21-L52","tags":["technical-description"],"name":"allowlist conditional on S3_ENDPOINT, unconditional fetch(url)"},{"url":"https://github.com/kanbn/kan/blob/v0.6.0/.env.example#L25-L27","tags":["technical-description"],"name":"S3_ENDPOINT documented as blank for AWS S3"},{"url":"https://github.com/kanbn/kan/security/advisories/GHSA-qrx8-9hc6-jvqg","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-qrx8-9hc6-jvqg)"},{"url":"https://github.com/kanbn/kan/commit/53397d8e81dc1494d94132848c1f0416f1152bd7","tags":["patch"],"name":"Incomplete fix for CVE-2026-32255"},{"url":"https://github.com/kanbn/kan","tags":["product"]},{"url":"https://www.vulncheck.com/advisories/kan-0.5.5-through-0.6.0-unauthenticated-ssrf-via-api-download-attatchment","name":"VulnCheck Advisory: Kan 0.5.5 through 0.6.0 Unauthenticated SSRF via /api/download/attatchment","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":9.2,"baseSeverity":"CRITICAL"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE","baseScore":8.6,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-14T14:17:03.232Z"},"datePublic":"2026-09-05T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:kan:kan:*:*:*:*:*:*:*:*","versionStartIncluding":"0.5.5","versionEndIncluding":"0.6.0"}]}]}],"credits":[{"lang":"en","value":"leediay153 from Viettel Post","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-16T16:46:50.369655Z","id":"CVE-2026-110628","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T17:16:01.554Z"}}]}}}