CVE-2026-100625 Capgo Build Upload Proxy Authorization Bypass via TUS Resource
Attackers with valid API keys can corrupt build artifacts of other jobs by bypassing authorization checks in the TUS upload proxy.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100625?
CVE-2026-100625 is a high-severity missing authorization vulnerability in Cap-go capgo.app, published on 26 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-441
Which versions are affected by CVE-2026-100625?
How do I fix CVE-2026-100625?
No fix has been published for CVE-2026-100625 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-100625 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100625 exists.
Sources
Also known as GHSA-vp2f-59w8-7r7r.