CVE-2026-56296
MEDIUMCap-go - App Existence Oracle via Unauthenticated transfer_app RPC
Title source: cnaDescription
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.
References (2)
Core 2
Core References
Vendor Advisory vendor-advisory
GitHub Security Advisory (GHSA-fmm3-3qcg-85j6)
https://github.com/Cap-go/capgo/security/advisories/GHSA-fmm3-3qcg-85j6
Third Party Advisory third-party-advisory
VulnCheck Advisory: Cap-go - App Existence Oracle via Unauthenticated transfer_app RPC
https://www.vulncheck.com/advisories/cap-go-app-existence-oracle-via-unauthenticated-transfer-app-rpc
Scores
CVSS v3
5.3
EPSS
0.0024
EPSS Percentile
15.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-203
Status
published
Products (2)
Cap-go/capgo
< 12.128.2
Cap-go/capgo
12.128.2
Published
Jul 11, 2026
Tracked Since
Jul 11, 2026