Auth bypass in Capgo
CVE-2026-56230
Capgo before 12.128.2 contains a broken object level authorization vulnerability in middlewareKey() that accepts the client-controlled x-limited-key-id header without validating ownership, allowing authenticated users to adopt cross-tenant limited keys. Attackers can supply another tenant's limited key ID to bypass authorization checks and access unauthorized cross-tenant resources across multiple API endpoints.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (38.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Capgo — versions 0, 12.128.2
Weakness classification (CWE)
References
- github.com/Cap-go/capgo/security/advisories/GHSA-cppm-733w-hg86 (vendor-advisory)
- www.vulncheck.com/advisories/capgo-broken-object-level-authorization-via-x-limi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56230?
- CVE-2026-56230 is a high-severity vulnerability in Capgo, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.8/10. Published 2026-06-30.
- How severe is CVE-2026-56230?
- High severity. CVSS v3 base score is 8.8 out of 10.