CVE-2026-104759 Details
Description
The WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN) plugin for WordPress is vulnerable to Authentication Bypass via OIDC Nonce Replay in all versions up to, and including, 44.1 This is due to `Id_Token_Service_Deprecated::process_openidconnect_token()` using the incompatible WordPress core `wp_verify_nonce()` function to validate a nonce produced by `Nonce_Service::create_nonce()` — a 64-character hex value that `wp_verify_nonce()` can never successfully verify — causing the nonce check to silently fail without terminating authentication, so execution continues into `authenticate_oidc_user()` with the attacker-supplied `id_token`. This makes it possible for unauthenticated attackers who have obtained a previously-issued, valid `id_token` for a target account to replay that token and authenticate as any WordPress user, including administrators, resulting in full site takeover. This vulnerability is only exploitable when the `use_id_token_parser_v2` plugin option is enabled, as this is the configuration that routes token processing through the deprecated parser containing the broken nonce check.
An authentication bypass vulnerability has been identified in the WPO365 | Seamless WordPress + Microsoft Integration (WPO365 | Login) plugin for WordPress, affecting all versions through 44.1. The vulnerability arises because the 'Id_Token_Service_Deprecated::process_openidconnect_token()' method improperly uses the WordPress core 'wp_verify_nonce()' function to validate a nonce created by 'Nonce_Service::create_nonce()'. This nonce, a 64-character hexadecimal value, cannot be correctly verified by 'wp_verify_nonce()', leading to a silent failure in the nonce validation. As a result, the authentication process continues without interruption, allowing unauthenticated attackers to replay valid 'id_tokens' and authenticate as any WordPress user, including administrators. This flaw can lead to a complete takeover of the affected site. The vulnerability is exploitable only when the 'use_id_token_parser_v2' option is enabled, as this configuration directs token processing through the deprecated parser that contains the faulty nonce verification.
Users are advised to update the WPO365 | Seamless WordPress + Microsoft Integration (WPO365 | Login) plugin to version 45.0 or a newer patched version.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 10, 2026CISA-ADP
Assessed Oct 11, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-287 | Improper Authentication | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| WPO365 | <= 44.1 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 11, 2026 | CVE Modified | CISA-ADP |
| Oct 10, 2026 | New CVE Received | [email protected] |