Auth bypass in Capgo
CVE-2026-56252
Capgo before 12.128.2 contains a scope isolation vulnerability in the POST /webhooks/test endpoint that allows app-scoped API keys to invoke org-scoped webhook operations. Attackers with app-scoped credentials can trigger signed outbound webhook deliveries for arbitrary organization webhooks outside their declared app boundary, bypassing the limited_to_apps authorization check.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Capgo — versions 0, 12.128.2
Weakness classification (CWE)
References
- github.com/Cap-go/capgo/security/advisories/GHSA-qvr7-f6j6-64wp (vendor-advisory)
- www.vulncheck.com/advisories/capgo-scope-isolation-failure-in-webhook-test-endp… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56252?
- CVE-2026-56252 is a medium-severity vulnerability in Capgo, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-07-12.
- How severe is CVE-2026-56252?
- Medium severity. CVSS v3 base score is 5.4 out of 10.