---
id: CVE-2026-100625
title: >-
  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 st…
summary: >-
  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 st…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:L'
cwe:
  - CWE-441
vendor: Cap-go
product: capgo.app
affected:
  - capgo.app
published: '2026-09-26'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T14:16:43.567'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100625'
references:
  - url: >-
      https://github.com/Cap-go/capgo.app/security/advisories/GHSA-r45q-x4gr-3mvv
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/capgo-build-upload-proxy-authorization-bypass-via-tus-resource
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-26T13:33:20.929Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.