Privilege escalation in Cap-Go Capgo.app
CVE-2026-88863
capgo.app (npm package `capgo`) through version 12.207.1 does not compare the caller's role rank against the requested role in the validateInvite() function of supabase/functions/_backend/private/invite_new_user_to_org.ts. The POST /private/invite_new_user_to_org endpoint only requires the org.update_user_roles permission for org_super_admin invitations, so an authenticated user holding only the org.invite_user permission (e.g., an org_member) can invite an external user as org_admin or org_billing_admin. When the invited account accepts the invitation via POST /private/accept_invitation, ensureOrgMembership creates the role binding using the Supabase service-role key, which bypasses the prevent_role_binding_priority_escalation and check_org_user_privileges database triggers. This allows privilege escalation resulting in full administrative control over the organization's apps, channels, members, and billing. The issue is addressed by pull request #3096, which compares the inviter's rank before permitting elevated invitations.
Vulnerability class: Privilege Escalation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (31.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/Cap-go/capgo.app/security/advisories/GHSA-7g7p-fxx8-4wm8 (vendor-advisory)
- www.vulncheck.com/advisories/capgo-app-through-12.207.1-privilege-escalation-vi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-88863?
- CVE-2026-88863 is a high-severity vulnerability in Cap-Go Capgo.app, classified under Improper Privilege Management. CVSS score: 8.1/10. Published 2026-09-10.
- How severe is CVE-2026-88863?
- High severity. CVSS v3 base score is 8.1 out of 10.