# CVE-2026-88863: capgo Privilege escalation in invite_new_user_to_org

Source: https://junglewise.ai/threats/cve-2026-88863-capgo-privilege-escalation-in-invite-new-user-to-org  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-10. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-88863 · Severity: high · CVSS 8.1 · Published 2026-09-10

capgo is an npm package providing backend API endpoints for managing organizational access and roles. An authenticated user with basic member-level permissions can bypass role rank checks to invite external users as organization administrators, gaining full control over apps, billing, and team members. This allows low-privileged insiders to escalate to administrative control over the entire organization.

## Quick answers

**Is CVE-2026-88863 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-88863 being exploited in the wild.

**How severe is CVE-2026-88863?** High severity, with a CVSS score of 8.1, published 10 September 2026.

**Which products and versions are affected?** Cap-go capgo through 12.207.1.

**Is there a fix for CVE-2026-88863?** A patch was published on 2026-08-26: Fix merged in PR #3096 and shipped in capgo 12.261.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-88863 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-88863?** Check whether anything you run is named in the advisory. 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 vulnerability is an improper privilege management flaw in the validateInvite() function within supabase/functions/_backend/private/invite_new_user_to_org.ts. The POST /private/invite_new_user_to_org endpoint fails to compare the inviter's role rank against the requested role; it only guards org_super_admin behind the org.update_user_roles permission, allowing org_member users (who hold only org.invite_user) to invite users as org_admin or org_billing_admin. When the invited account accepts via POST /private/accept_invitation, role binding is created using Supabase's service-role key, which bypasses database-level rank enforcement triggers (prevent_role_binding_priority_escalation and check_org_user_privileges). An authenticated user with org_member role can exploit this with no additional user interaction required. The fix, merged in PR #3096, adds rank comparison logic before permitting elevated role invitations and was shipped in capgo version 12.261.0 on 2026-08-26.

## Affected products

- Cap-go capgo through 12.207.1

## Timeline

- 2026-08-27: disclosed
- 2026-08-26: patched: Fix merged in PR #3096 and shipped in capgo 12.261.0
- 2026-09-10: advisory

## References

- [https://github.com/Cap-go/capgo.app/security/advisories/GHSA-7g7p-fxx8-4wm8](https://github.com/Cap-go/capgo.app/security/advisories/GHSA-7g7p-fxx8-4wm8)
- [https://www.vulncheck.com/advisories/capgo-app-through-12.207.1-privilege-escalation-via-invite-new-user-to-org](https://www.vulncheck.com/advisories/capgo-app-through-12.207.1-privilege-escalation-via-invite-new-user-to-org)