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Vulnerability record · CVE-2026-82843 · published 23 September 2026

CVE-2026-82843: Improper authentication vulnerability

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.

9.0 CVSS 3.1 Critical EPSS 0.19% · top 92.6% CWE-287 · Improper authentication Deferred
9.0CVSS 3.1 base score
0.19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
24 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

References

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

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-82843), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.