WPO365 | LOGIN <= 44.1 - Unauthenticated Authentication Bypass via OIDC Nonce Replay
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 flaw exists because Id_Token_Service_Deprecated::process_openidconnect_token() utilizes the incompatible WordPress core wp_verify_nonce() function to validate a nonce generated by Nonce_Service::create_nonce(). Because this nonce is a 64-character hex value that wp_verify_nonce() cannot successfully verify, the nonce validation silently fails without aborting authentication. Execution then continues into authenticate_oidc_user() with the attacker-supplied id_token.
Consequently, an unauthenticated attacker who has obtained a previously issued, valid id_token for a target account can replay that token and authenticate as any WordPress user, including administrators, leading to complete site takeover.
This vulnerability is only exploitable when the use_id_token_parser_v2 plugin option is enabled, which routes token processing through the deprecated parser containing the broken nonce check.
What to do
Update to version 45.0 or later.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN) | <= 44.1 | 45.0 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-287- Platform
- WordPress
- Package
WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN)- Disclosed
- 09.10.2026
- Updated
- 13.10.2026 13:52
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Vulnerability history: WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN)
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 8
- First → latest
- 10.2020 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 3
- Medium 4
Disclosures per year
- 2020: 1
- 2021: 1
- 2022: 0
- 2023: 0
- 2024: 1
- 2025: 0
- 2026: 5
-
WPO365 | LOGIN <= 44.1 - Unauthenticated Authentication Bypass via OIDC Nonce Replay this entry
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