CVE-2026-56338
MEDIUMCapgo - Denial of Service in 2FA Email Verification via /auth/v1/otp Endpoint
Title source: cnaDescription
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.
References (2)
Core 2
Core References
Vendor Advisory vendor-advisory
GitHub Security Advisory (GHSA-m53g-7gcj-x6f7)
https://github.com/Cap-go/capgo/security/advisories/GHSA-m53g-7gcj-x6f7
Third Party Advisory third-party-advisory
VulnCheck Advisory: Capgo - Denial of Service in 2FA Email Verification via /auth/v1/otp Endpoint
https://www.vulncheck.com/advisories/capgo-denial-of-service-in-2fa-email-verification-via-auth-v1-otp-endpoint
Scores
CVSS v3
5.3
EPSS
0.0028
EPSS Percentile
20.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-703
Status
published
Products (2)
Capgo/Capgo
< 12.128.2
Capgo/Capgo
12.128.2
Published
Jun 24, 2026
Tracked Since
Jun 24, 2026