Vulnerability in Cap-Go Capgo
CVE-2026-56296
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 · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (27.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Cap-Go Capgo — versions 0, 12.128.2
Weakness classification (CWE)
References
- github.com/Cap-go/capgo/security/advisories/GHSA-fmm3-3qcg-85j6 (vendor-advisory)
- www.vulncheck.com/advisories/cap-go-app-existence-oracle-via-unauthenticated-tr… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56296?
- CVE-2026-56296 is a medium-severity vulnerability in Cap-Go Capgo, classified under Observable Discrepancy. CVSS score: 5.3/10. Published 2026-07-11.
- How severe is CVE-2026-56296?
- Medium severity. CVSS v3 base score is 5.3 out of 10.