CVE-2026-15612
Logto, an OpenID Connect implementation, has a flaw that lets attackers bypass nonce validation when the nonce claim is missing from the ID token. This allows replay of authentication tokens, effectively breaking session binding. The issue is rated critical due to its high impact on confidentiality and integrity.
No official fix yet. If none appears within 45 days of first tracking, this entry is removed automatically.
Who is affected
The vulnerability is reported in Logto, an OIDC implementation; no specific product versions are listed in the available data.
Real-world impact
An attacker could capture a valid authentication token and reuse it to impersonate a legitimate user, gaining unauthorized access to protected resources without needing any user interaction.
Why this severity
The CVSS score of 9.1 reflects a network-based attack with low complexity, no required privileges, and no user interaction, yet it fully compromises confidentiality and integrity of user sessions.
What to do about it
No official fix or mitigation is documented in the sources yet. Monitor the vendor advisory and apply the patch as soon as it is released.
No fix documented in sources
Timeline
- Jul 23, 2026 · 9d agoPublishedDisclosed and added to the National Vulnerability Database.
- Jul 27, 2026 · 5d agoAdvisory updatedThe NVD record was last revised.