Vulnerability · Published Jul 11, 2026 · Assigned by VulnCheck
CVE-2026-56296Cap-go - App Existence Oracle via Unauthenticated transfer_app RPC
Medium 5.3
In plain English
A medium-severity security flaw in capgo from Cap-go. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.3%top 76.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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 (as reported)
Weakness: CWE-203 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
References
- GitHub Security Advisory (GHSA-fmm3-3qcg-85j6) vendor-advisory
- VulnCheck Advisory: Cap-go - App Existence Oracle via Unauthenticated transfer_app RPC third-party-advisory