Auth bypass in Cap-Go Capgo.app
CVE-2026-100629
Capgo (capgo.app backend) before 12.127.5 contains an authorization flaw in the PATCH /private/role_bindings/:binding_id endpoint. The handler verifies that the newly assigned role's priority rank does not exceed the caller's own rank, but — unlike the DELETE handler — it never checks the rank of the role currently bound to the target binding. An authenticated user holding the org_admin role (rank 90) can therefore change an org_super_admin binding (rank 95) to a lower-privileged role such as org_member (rank 75). Because the prevent_last_super_admin_binding_delete database trigger fires only BEFORE DELETE and not on UPDATE, an org_admin can demote every org_super_admin, leaving the organization with no super administrator. The issue is fixed in 12.127.5.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:L.
EPSS exploit prediction
EPSS: 0.003 (26.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.9% 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: +0.001
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-54mj-q77q-xwx5) (vendor-advisory)
- VulnCheck Advisory: Capgo backend before 12.127.5 Privilege Escalation via role_bindings PATCH (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100629?
- CVE-2026-100629 is a medium-severity vulnerability in Cap-Go Capgo.app, classified under Incorrect Authorization. CVSS score: 5.5/10. Published 2026-09-26.
- How severe is CVE-2026-100629?
- Medium severity. CVSS v3 base score is 5.5 out of 10.