Capgo Build Upload Proxy Authorization Bypass via TUS ResourceCapgo (capgo.ap... CVE: New / 1d 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...

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.

PUBLISHED Reserved 2026-09-26 | Published 2026-09-26 | Updated 2026-09-26 | Assigner VulnCheck

HIGH: 8.7 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 HIGH: 7.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:L Problem types Unintended Proxy or Intermediary ('Confused Deputy') Product status Default status unaffected Credits Judel777 reporter References github.com/...go.app/security/advisories/GHSA-r45q-x4gr-3mvv (GitHub Security Advisory (GHSA-r45q-x4gr-3mvv)) vendor-advisory (VulnCheck Advisory: Capgo Build Upload Proxy Authorization Bypass via TUS Resource) third-party-advisory cve.org (CVE-2026-100625) nvd.nist.gov (CVE-2026-100625) Download JSON

Unintended Proxy or Intermediary ('Confused Deputy')

github.com/...go.app/security/advisories/GHSA-r45q-x4gr-3mvv (GitHub Security Advisory (GHSA-r45q-x4gr-3mvv)) vendor-advisory

(VulnCheck Advisory: Capgo Build Upload Proxy Authorization Bypass via TUS Resource) third-party-advisory

cve.org (CVE-2026-100625)

nvd.nist.gov (CVE-2026-100625)