CVE-2026-82843 — WP OAuth Server < 6.4.0 - Subscriber+ Cross-User Account Takeover via OIDC ID Token Substitution

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Unknown / WP OAuth Server ( Login with WordPress )	affected 0 before 6.4.0

CWE

No CWE identifiers supplied.

References

https://wpscan.com/vulnerability/45bc7096-5d04-4fe6-a332-31aed507a3a0/

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.