Vulnerability · Published Sep 26, 2026 · Assigned by VulnCheck

CVE-2026-100629Capgo backend before 12.127.5 Privilege Escalation via role_bindings PATCH

Medium 5.5

In plain English

A medium-severity incorrect authorization in capgo.app from Cap-go. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities).

Severity (CVSS 3.1)5.5Medium

Exploit odds (30 days)0.3%top 73.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Cap-go	capgo.app	0 – before 12.127.5

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:L

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