{"id":"CVE-2026-100625","state":"PUBLISHED","title":"Capgo Build Upload Proxy Authorization Bypass via TUS Resource","description":"Capgo (capgo.app) exposes a native build TUS upload proxy (supabase/functions/_backend/public/build/upload.ts) that authorizes a caller against a single build job identified by the supplied builder_job_id and validates only that job's stored upload_path, but then forwards the user-controlled TUS resource suffix taken from /build/upload/:jobId/* to the builder service while injecting Capgo's privileged builder API key. Because the forwarded suffix is never bound to the authorized job's upload_path or upload_session_key, a caller holding a valid 'all' or 'write' Capgo API key with app.build_native permission for one application can use its authorized proxy path for job A to write to the TUS upload resource of another job B, provided that resource suffix is known or exposed, corrupting that build's artifacts. All versions are affected; no patch was available at the time of advisory publication.","publishedAt":"2026-09-26T13:23:03.030Z","updatedAt":"2026-09-30T17:20:12.129Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["Cap-go capgo.app"],"affected":[{"vendor":"Cap-go","product":"capgo.app","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"*","versionType":"custom"}]}],"references":["https://github.com/Cap-go/capgo.app/security/advisories/GHSA-r45q-x4gr-3mvv","https://www.vulncheck.com/advisories/capgo-build-upload-proxy-authorization-bypass-via-tus-resource"],"weaknesses":["CWE-441"],"ingestedAt":"2026-10-29T20:10:13.529Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/100xxx/CVE-2026-100625.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-100625","state":"PUBLISHED","datePublished":"2026-09-26T13:23:03.030Z","dateUpdated":"2026-09-30T17:20:12.129Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-09-26T02:31:07.602Z"},"containers":{"cna":{"title":"Capgo Build Upload Proxy Authorization Bypass via TUS Resource","descriptions":[{"lang":"en","value":"Capgo (capgo.app) exposes a native build TUS upload proxy (supabase/functions/_backend/public/build/upload.ts) that authorizes a caller against a single build job identified by the supplied builder_job_id and validates only that job's stored upload_path, but then forwards the user-controlled TUS resource suffix taken from /build/upload/:jobId/* to the builder service while injecting Capgo's privileged builder API key. Because the forwarded suffix is never bound to the authorized job's upload_path or upload_session_key, a caller holding a valid 'all' or 'write' Capgo API key with app.build_native permission for one application can use its authorized proxy path for job A to write to the TUS upload resource of another job B, provided that resource suffix is known or exposed, corrupting that build's artifacts. All versions are affected; no patch was available at the time of advisory publication."}],"affected":[{"vendor":"Cap-go","product":"capgo.app","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"*","versionType":"custom"}]}],"references":[{"url":"https://github.com/Cap-go/capgo.app/security/advisories/GHSA-r45q-x4gr-3mvv","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-r45q-x4gr-3mvv)"},{"url":"https://www.vulncheck.com/advisories/capgo-build-upload-proxy-authorization-bypass-via-tus-resource","name":"VulnCheck Advisory: Capgo Build Upload Proxy Authorization Bypass via TUS Resource","tags":["third-party-advisory"]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","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:N/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS"},{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:L","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-441","lang":"en","description":"Unintended Proxy or Intermediary ('Confused Deputy')","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-09-30T17:20:12.129Z"},"datePublic":"2026-09-08T00:00:00.000Z","credits":[{"lang":"en","value":"Judel777","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/Cap-go/capgo.app/security/advisories/GHSA-r45q-x4gr-3mvv","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-30T12:57:03.291979Z","id":"CVE-2026-100625","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-30T12:57:56.565Z"}}]}}}