CVE-2026-56296 | THREATINT

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.

PUBLISHED Reserved 2026-06-20 | Published 2026-07-11 | Updated 2026-07-13 | Assigner VulnCheck

MEDIUM: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Problem types

Observable Discrepancy

Product status

Default status

unaffected

Any version before 12.128.2

affected

12.128.2 (semver)

unaffected

Credits

Judel777 reporter

References

github.com/.../capgo/security/advisories/GHSA-fmm3-3qcg-85j6 exploit

github.com/.../capgo/security/advisories/GHSA-fmm3-3qcg-85j6 (GitHub Security Advisory (GHSA-fmm3-3qcg-85j6)) vendor-advisory

www.vulncheck.com/...le-via-unauthenticated-transfer-app-rpc (VulnCheck Advisory: Cap-go - App Existence Oracle via Unauthenticated transfer_app RPC) third-party-advisory

cve.org (CVE-2026-56296)

nvd.nist.gov (CVE-2026-56296)

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