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

Quick assessment

Affected
Unknown WP OAuth Server ( Login with WordPress )
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

EPSS 0.18% · P8

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown WP OAuth Server ( Login with WordPress ) < 6.4.0 affected
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I. Basic Information for CVE-2026-82843

Vulnerability Information

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Vulnerability Title
WP OAuth Server < 6.4.0 - Subscriber+ Cross-User Account Takeover via OIDC ID Token Substitution
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unknown WP OAuth Server ( Login with WordPress ) 0 ~ 6.4.0 -

II. Public POCs for CVE-2026-82843

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III. Intelligence Information for CVE-2026-82843

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Other References for CVE-2026-82843 (1)

Same Patch Batch · Unknown · 2026-09-23 · 57 CVEs total

CVE-2026-86601 6.5 MEDIUM WP Recipe Maker < 10.8.2 - Unauthenticated Arbitrary Shortcode Execution via Comment Conte
CVE-2026-86612 5.6 MEDIUM Ninja Tables < 5.2.17 - Unauthenticated Arbitrary Shortcode Execution via Fluent Forms Dat
CVE-2026-90950 5.3 MEDIUM Paid Member Subscriptions < 3.1.0 - Unauthenticated reCAPTCHA Bypass via Registration Form
CVE-2026-87978 5.3 MEDIUM Paymob for WooCommerce < 4.1.14 - Unauthenticated Payment Bypass via Unverified Subscripti
CVE-2026-87071 5.3 MEDIUM Forminator Forms < 1.57.2.1 - Unauthenticated Post Meta Injection on Submitted Posts
CVE-2026-87070 5.3 MEDIUM Forminator Forms < 1.57.2.1 - Unauthenticated Poll Vote Limit Bypass via IP Spoofing
CVE-2026-84091 5.3 MEDIUM SUMIT Payment Gateway for WooCommerce < 4.0.0 - Unauthenticated Payment Confirmation Forge
CVE-2026-86604 4.8 MEDIUM GTranslate < 5.0.1 - Unauthenticated Arbitrary Shortcode Execution via Email Translation
CVE-2026-87848 3.7 LOW MPCX Lightbox 1.2.2 - 1.2.5 - Unauthenticated Non-Public Post Content Disclosure
CVE-2026-84046 Directorist < 8.9.5 - Subscriber+ SSRF via Avatar URL
CVE-2026-83555 Email Subscribers by Icegram Express < 5.9.35 - Unauthenticated Subscription Status Change
CVE-2026-84168 Easy Hide Login < 1.7 - Login Page Protection Bypass / Hidden URL Disclosure
CVE-2026-84742 The Events Calendar 6.15.0 - 6.17.4.1 - Contributor+ Content Publication via TEC V1 REST A
CVE-2025-15696 Real3D Flipbook Lite < 5.4 - Author+ Stored XSS
CVE-2026-84027 Directorist 8.9.1 - 8.9.4 - Subscriber+ Paid Order and Payment Record Forgery via REST Ord
CVE-2026-84098 Directorist 3.1.0 - 8.9.4 - Subscriber+ Arbitrary Listing Deletion via remove_listing
CVE-2026-84150 Directorist < 8.9.5 - Subscriber+ Cross-User Favorites Read and Write via REST Favorites E
CVE-2026-81339 MasterStudy LMS < 3.7.50 - Subscriber+ Quiz Attempt Grade Disclosure via IDOR
CVE-2026-81338 MasterStudy LMS < 3.7.50 - Subscriber+ Stored HTML Injection via Course Discussions
CVE-2026-84743 The Events Calendar 6.15.16.1 - 6.17.4.1 - Contributor+ Event/Venue/Organizer Update, Tras

Showing top 20 of 57 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: WP OAuth Server ( Login with WordPress )
Same vendor: Unknown

V. Comments for CVE-2026-82843

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