CVE-2026-15611

CRITICAL 9.1

Unverified email-based SSO account linking

CVSS Score

9.1

EPSS Score

0.2%

EPSS Percentile

5th

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.

Vendor	logto
Product	logto
Published	Jul 23, 2026
Last Updated	Jul 27, 2026

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Affected Versions

Logto / Logto

1.11.0 ≤ 1.37.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/logto-io/logto/blob/ea3ede35028dfd0bbb6d7b239623ce0e7f6cdff8/packages/core/src/libraries/verification-helpers/single-sign-on.ts#L274 github.com: https://github.com/logto-io/logto/blob/ea3ede35028dfd0bbb6d7b239623ce0e7f6cdff8/packages/core/src/routes/experience/classes/verifications/enterprise-sso-verification.ts#L284-L297