Vulnerability in Capgo
CVE-2026-56338
Capgo before 12.128.2 contains a denial of service vulnerability in the /auth/v1/otp endpoint that prevents email verification for two-factor authentication due to captcha validation failures. Authenticated users cannot complete 2FA enrollment as the backend consistently returns HTTP 500 errors with captcha verification process failed messages, blocking access to security controls.
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:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.005 (39.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.9% 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-m53g-7gcj-x6f7 (vendor-advisory)
- www.vulncheck.com/advisories/capgo-denial-of-service-in-2fa-email-verification-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56338?
- CVE-2026-56338 is a medium-severity vulnerability in Capgo, classified under CWE-703. CVSS score: 5.3/10. Published 2026-06-24.
- How severe is CVE-2026-56338?
- Medium severity. CVSS v3 base score is 5.3 out of 10.