CVE-2026-15611

CRITICAL

Logto - Unverified Email-Based SSO Account Linking

Title source: rule

Description

Logto allows unverified email-based SSO account linking, enabling an attacker to register an identity at a permissive IdP using a victim’s email and gain unauthorized access to the victim’s account.

References (2)

Core 2

Core References

https://github.com/logto-io/logto/blob/ea3ede35028dfd0bbb6d7b239623ce0e7f6cdff8/packages/core/src/libraries/verification-helpers/single-sign-on.ts#L274

View Writeup ZIP pw:eip

https://github.com/logto-io/logto/blob/ea3ede35028dfd0bbb6d7b239623ce0e7f6cdff8/packages/core/src/routes/experience/classes/verifications/enterprise-sso-verification.ts#L284-L297

View Writeup ZIP pw:eip

Scores

CVSS v3 9.1

EPSS 0.0027

EPSS Percentile 19.6%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-287

Status published

Products (1)

Logto/Logto 1.11.0 - 1.37.1

Published Jul 23, 2026

Tracked Since Jul 23, 2026