CVE-2026-100617: Cap-go capgo.app Authorization Bypass via channel_permission_overrides

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-26 · updated 2026-09-30
Weakness: CWE-862

Description

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.

Affected products

Cap-go capgo.app: all versions

References

https://github.com/Cap-go/capgo.app/security/advisories/GHSA-626c-p6fq-3whq
https://www.vulncheck.com/advisories/cap-go-capgo-app-authorization-bypass-via-channel-permission-overrides
https://github.com/Cap-go/capgo.app/security/advisories/GHSA-626c-p6fq-3whq

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