TI-2026-13138 Aliases CVE-2026-15616 GHSA-cv5x-2gg8-4hc7

Local MFA not enforced during SSO sign-in

MEDIUM 46CWE-308Published 2026-07-23 · Updated 2026-07-27

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

Logto does not enforce locally configured MFA during SSO authentication, allowing users to bypass second-factor requirements and grants unauthorized access.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00529 44th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Logto	Logto	1.19.0 – 1.37.1	—	No fix listed	CNA

Logto VendorLogto Affected 1.19.0 – 1.37.1 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-15616
2026-10-03 Alias added: GHSA-cv5x-2gg8-4hc7

References

Other 1

https://github.com/logto-io/logto/blob/ea3ede35028dfd0bbb6d7b239623ce0e7f6cdff8/packages/core/src/routes/experience/classes/experience-interaction.ts#L538-L540

TI-2026-13135 LOIDC nonce validation bypass CVSS 3.1CRITICAL 9.1
TI-2026-13139 Principal/domain lookup without case normalization CVSS 3.1CRITICAL 9.1
TI-2026-13134 Unverified email-based SSO account linking CVSS 3.1CRITICAL 9.1
TI-2026-13136 IdP-initiated SAML sessions not reliably invalidated (replay) CVSS 3.1HIGH 7.5
TI-2026-13137 SAML <Conditions> element not validated CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences