Unrated severityNVD Advisory· Published Jul 11, 2026· Updated Jul 13, 2026
Cap-go - App Existence Oracle via Unauthenticated transfer_app RPC
CVE-2026-56296
Description
Cap-go before 12.128.2 contains an information disclosure vulnerability in the public.transfer_app RPC function that returns distinct error messages for existing versus non-existing app IDs. Unauthenticated attackers can enumerate valid app IDs by observing error message differences when calling transfer_app with only the publishable API key.
Affected products
1Patches
Vulnerability mechanics
References
2- github.com/Cap-go/capgo/security/advisories/GHSA-fmm3-3qcg-85j6mitrevendor-advisory
- www.vulncheck.com/advisories/cap-go-app-existence-oracle-via-unauthenticated-transfer-app-rpcmitrethird-party-advisory
News mentions
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