Auth bypass in Capgo
CVE-2026-56232
Capgo before 12.128.2 fails to enforce limited_to_orgs and limited_to_apps constraints on subkeys provided via x-limited-key-id header in middlewareKey function. Attackers can bypass subkey scope restrictions by referencing their own subkeys, causing all downstream route handlers to use the unrestricted parent key instead of the scoped subkey.
Vulnerability class: Broken Access Control
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 (38.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.3% 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-2h89-vcvx-5pvh (vendor-advisory)
- www.vulncheck.com/advisories/capgo-subkey-scope-bypass-in-middlewarekey-via-x-l… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56232?
- CVE-2026-56232 is a high-severity vulnerability in Capgo, classified under Incorrect Authorization. CVSS score: 8.8/10. Published 2026-06-24.
- How severe is CVE-2026-56232?
- High severity. CVSS v3 base score is 8.8 out of 10.