Vulnerability in Cap-Go Capgo.app
CVE-2026-100625
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 · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:L.
EPSS exploit prediction
EPSS: 0.003 (22.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-r45q-x4gr-3mvv) (vendor-advisory)
- VulnCheck Advisory: Capgo Build Upload Proxy Authorization Bypass via TUS Resource (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100625?
- CVE-2026-100625 is a high-severity vulnerability in Cap-Go Capgo.app, classified under Unintended Proxy or Intermediary (Confused Deputy). CVSS score: 7.1/10. Published 2026-09-26.
- How severe is CVE-2026-100625?
- High severity. CVSS v3 base score is 7.1 out of 10.