Auth bypass in Cap-Go Capgo.app
CVE-2026-100617
Cap-go capgo.app fails to validate that principals in channel_permission_overrides belong to the organization, allowing authenticated app/org admins to grant channel permissions to non-member users. Attackers with admin privileges can insert override rows with arbitrary external user UUIDs to grant channel-scoped permissions such as channel.promote_bundle to users outside the organization.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (32.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-626c-p6fq-3whq) (vendor-advisory)
- VulnCheck Advisory: Cap-go capgo.app Authorization Bypass via channel_permission_overrides (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100617?
- CVE-2026-100617 is a high-severity vulnerability in Cap-Go Capgo.app, classified under Missing Authorization. CVSS score: 8.8/10. Published 2026-09-26.
- How severe is CVE-2026-100617?
- High severity. CVSS v3 base score is 8.8 out of 10.