CVE-2026-82843
CriticalCVSS 9.0Summary
The WP OAuth Server (Login with WordPress) WordPress plugin before 6.4.0 does not bind the OpenID Connect identity assertion it issues to the authorization grant being exchanged, returning instead the assertion belonging to whichever user authenticated most recently. This allows users with the Subscriber role and above to obtain a validly signed identity assertion for another user, including an administrator, and authenticate as them at any application that uses the site for single sign-on.
Risk Assessment
A low-privileged attacker can impersonate an administrator in applications relying on this site as an SSO provider, leading to full compromise of those systems.
Recommendation
Update the WP OAuth Server plugin to version 6.4.0 or later. Until patched, consider disabling the OpenID Connect single sign-on feature.
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Original NVD description (English source)
The WP OAuth Server ( Login with WordPress ) WordPress plugin before 6.4.0 does not bind the OpenID Connect identity assertion it issues to the authorization grant being exchanged, returning instead the assertion belonging to whichever user authenticated most recently, which allows users with the Subscriber role and above to obtain a validly signed identity assertion for another user, including an administrator, and authenticate as them at any application that uses the site for single sign-on.