Auth bypass in Capgo
CVE-2026-56321
Capgo (backend Supabase edge functions) before 12.128.2 does not apply the global authentication middleware to the GET /private/role_bindings/:org_id endpoint, unlike the POST and DELETE role_bindings routes, so unauthenticated requests reach the handler instead of being rejected at the middleware layer. The handler still performs its own authorization check and returns Unauthorized, so no direct data exposure occurs; the flaw is inconsistent authentication enforcement across HTTP methods that could enable authorization bypass if the handler logic changes.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (37.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Capgo — versions 0, 12.128.2
Weakness classification (CWE)
References
- github.com/Cap-go/capgo/security/advisories/GHSA-6c9f-9v99-26ww (vendor-advisory)
- www.vulncheck.com/advisories/capgo-missing-authentication-middleware-on-get-pri… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56321?
- CVE-2026-56321 is a medium-severity vulnerability in Capgo, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2026-06-22.
- How severe is CVE-2026-56321?
- Medium severity. CVSS v3 base score is 5.3 out of 10.