CVE-2026-82843

Summary

This flaw allows users with the Subscriber role and above to obtain a valid identity assertion for another user, including administrators, and authenticate as them, due to the plugin not binding the OpenID Connect identity assertion to the correct authorization grant.

Exploitability

Exploitation is relatively straightforward as it requires a user with the Subscriber role or higher to authenticate and then obtain the assertion of another user. Precondition is the presence of the WP OAuth Server plugin before version 6.4.0.

Blast radius

If exploited, this flaw could lead to unauthorized access and potential full control over the affected WordPress site, including actions performed by administrators.

Detection

No reliable host or network indicator is derivable from the published description.

Prioritized remediation

Upgrade to WP OAuth Server version 6.4.0 or later.

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.