CVE-2026-100617
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 .
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
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-626c-p6fq-3whq (vendor-advisory)
- www.vulncheck.com/advisories/cap-go-capgo-app-authorization-bypass-via-channel-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100617?
- CVE-2026-100617 is a high-severity vulnerability, 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.