CVE-2026-100627
CVE-2026-100627
Capgo (Cap-go/capgo.app) server backend Supabase functions contain an incorrect authorization flaw in the API-key bundle promotion path. The PUT /bundle endpoint, available to "all" and "write" API keys, dispatches to setChannel, which authorizes with checkPermission(c, 'channel.promote_bundle', { appId: body.app_id }) and omits the request's channel_id. Because the omitted scope field is passed to rbac_check_permission_direct as SQL NULL, and channel-scope override evaluation is gated on p_channel_id IS NOT NULL, per-channel allow/deny overrides are never evaluated. A principal holding app-level channel.promote_bundle (granted by default to the app_developer and app_uploader roles) can therefore promote a bundle to a channel for which an explicit per-channel deny override exists, updating public.channels.version for the supplied channel_id; the target channel is only validated after authorization. The issue is confirmed on main at commit de66fa51e7ff2f50283cc1455c3d80ab3eb0ae43 and likely earlier versions; no patched version is known at the time of publication.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published .
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:N/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Weakness classification (CWE)
References
- github.com/Cap-go/capgo.app/security/advisories/GHSA-633x-9x77-77gf (vendor-advisory)
- www.vulncheck.com/advisories/capgo-bundle-promotion-api-channel-rbac-deny-overr… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100627?
- CVE-2026-100627 is a high-severity vulnerability, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.1/10. Published 2026-09-26.
- How severe is CVE-2026-100627?
- High severity. CVSS v3 base score is 8.1 out of 10.