CVE-2026-82843
CRITICALCVSS 9.0Description
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.
Timeline
Published:September 23rd, 2026 6:17 AM
Last modified:September 24th, 2026 2:43 PM
CVSS Scoring
CVSS v3: 9.0 (CRITICAL)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Weaknesses (CWE)
References & Reports
Advisories, patches, and third-party reports
Source: NIST NVD · Data may lag official sources by up to one minute