Vulnerability DatabaseCVE-2026-56296
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CVE-2026-56296
Published:July 11, 2026
Updated:July 21, 2026
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 Packages
https://github.com/Cap-go/capgo.git (GITHUB):
Affected version(s) >=capgo-12.123.9 <capgo-12.128.2
Fix Suggestion:
Update to version capgo-12.128.2
Related Resources (2)
https://www.vulncheck.com/advisories/cap-go-app-existence-oracle-via-unauthenticated-transfer-app-rpc
https://github.com/Cap-go/capgo/security/advisories/GHSA-fmm3-3qcg-85j6
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Observable Discrepancy
CWE-203
EPSS
Base Score:
0.24