CVE-2026-56081

Critical

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.

SeverityCritical
CVSS9.1
Exploit probability—
ProductCap-go Capgo
PublishedJun 19, 2026
First seenJun 19, 2026
Weakness typeCWE-640CWE-640

How to fix

Update
  • Cap-go capgo12.128.2 or later

Affected products

ProductAffected versionsFixed in
Cap-go capgov < 12.128.212.128.2

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