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TI-2026-13134 Aliases CVE-2026-15611GHSA-26cp-25m8-5fgc

Unverified email-based SSO account linking

Priority MEDIUM 42CWE-287Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-287.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00482 41st 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
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
LogtoLogto1.11.0 – 1.37.1—No fix listedCNA
  • Logto VendorLogto Affected 1.11.0 – 1.37.1 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-15611
  2. 2026-10-03 Alias added: GHSA-26cp-25m8-5fgc

References

Other 2

  • 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-2026-13138 Local MFA not enforced during SSO sign-in 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