CVE-2026-15616criticalCWE-308

CVE-2026-15616: critical vulnerability in Logto

Local MFA not enforced during SSO sign-in

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28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.1epss 0.5%
Logto does not enforce locally configured MFA during SSO authentication, allowing users to bypass second-factor requirements and grants unauthorized access.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected products
Logto · Logto
Related CVEs — Logto

In the same product, most dangerous first.

CVE-2026-15611CRITICALUnverified email-based SSO account linkingEPSS 0.5%CVE-2026-15617CRITICALPrincipal/domain lookup without case normalizationEPSS 0.4%CVE-2026-15614HIGHIdP-initiated SAML sessions not reliably invalidated (replay)EPSS 0.3%CVE-2026-15612CRITICALLOIDC nonce validation bypassEPSS 0.2%CVE-2026-15615HIGHSAML <Conditions> element not validatedEPSS 0.2%