CVE-2026-82843
Critical
Description
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.
SeverityCritical
CVSS9.0
Exploit probability—
ProductWP OAuth Server ( Login with WordPress )
PublishedSep 23, 2026
First seenSep 23, 2026
Weakness typeCWE-287Improper authentication
How to fix
Update
- WP OAuth Server ( Login with WordPress )6.4.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| WP OAuth Server ( Login with WordPress ) | v < 6.4.0 | 6.4.0 |
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