# CVE-2026-100629: Capgo backend authorization flaw in role bindings PATCH endpoint

Source: https://junglewise.ai/threats/cve-2026-100629-capgo-capgo-app-backend-before-12-127-5-contains-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-26. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-100629 · Severity: medium · CVSS 5.5 · Published 2026-09-26

Capgo is a backend service that manages application deployments and organizational access control. An administrator with standard org_admin privileges can demote any super_admin user to a regular member, and by exploiting a database trigger oversight, can remove all super_admins from an organization. This leaves the organization without any privileged administrators, preventing critical functions like billing management and app deletion.

Vendors: [Capgo](https://junglewise.ai/threats/vendors/capgo).

## Quick answers

**Is CVE-2026-100629 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-100629 being exploited in the wild.

**How severe is CVE-2026-100629?** Medium severity, with a CVSS score of 5.5, published 26 September 2026.

**Which products and versions are affected?** Capgo Backend before 12.127.5.

**Is there a fix for CVE-2026-100629?** A patch was published on 2026-09-26: Fixed in version 12.127.5 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-100629 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-100629?** Check whether you run Capgo Backend at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The PATCH /private/role_bindings/:binding_id endpoint validates only that a new role's priority rank does not exceed the caller's rank, but fails to check the existing binding's role rank—a check that the DELETE handler correctly performs. An authenticated org_admin (rank 90) can therefore demote an org_super_admin (rank 95) to org_member (rank 75). Additionally, the prevent_last_super_admin_binding_delete database trigger fires only on DELETE operations, not UPDATE, allowing complete removal of all super_admin bindings via PATCH requests.

## Affected products

- Capgo backend before 12.127.5

## Timeline

- 2026-09-26: disclosed
- 2026-09-26: patched: Fixed in version 12.127.5

## References

- [https://github.com/Cap-go/capgo.app/security/advisories/GHSA-54mj-q77q-xwx5](https://github.com/Cap-go/capgo.app/security/advisories/GHSA-54mj-q77q-xwx5)
- [https://www.vulncheck.com/advisories/capgo-backend-before-12.127.5-privilege-escalation-via-role-bindings-patch](https://www.vulncheck.com/advisories/capgo-backend-before-12.127.5-privilege-escalation-via-role-bindings-patch)