What’s Vulnerable › Vulnerabilities
CVE-2026-56081: Cap-go - Account Lockout via 2FA Misconfiguration on Unverified Email
- Severity: critical (CVSS 9.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-19 · updated 2026-10-25
- Weakness: CWE-640
Description
Cap-go before 12.128.2 contains an authentication logic flaw that lets an attacker register and control an account bound to a victim's email address before that email is verified. By enabling two-factor authentication on the pre-registered account, the attacker gains control over the account claimed under the victim's identity, allowing them to read and modify its state and enforce organization-level policies, while the legitimate user is denied access to the account tied to their own email.
Affected products
- Cap-go capgo: before 12.128.2 — fixed in 12.128.2
How to fix
Upgrade to a fixed version: Cap-go capgo 12.128.2. Check the vendor advisory for mitigations.
References
- https://github.com/Cap-go/capgo/security/advisories/GHSA-j4cx-5pw6-5v5j
- https://www.vulncheck.com/advisories/cap-go-account-lockout-via-2fa-misconfiguration-on-unverified-email
- https://github.com/Cap-go/capgo/security/advisories/GHSA-j4cx-5pw6-5v5j
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