---
title: "CVE-2026-104759: WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN) - Authentication Bypass"
description: "WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN) <= 44.1 contains an authentication bypass caused by improper nonce validation in Id_Token_Service_Deprecated::process_openidconnect_token(), letting unauthenticated attackers replay valid id_tokens to authenticate as any user, exploit requires use_id_token_parser_v2 plugin option enabled."
url: https://panop.io/threat-heartbeat/CVE-2026-104759/
---

# CVE-2026-104759 WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN) - Authentication Bypass

WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN) <= 44.1 contains an authentication bypass caused by improper nonce validation in Id\_Token\_Service\_Deprecated::process\_openidconnect\_token(), letting unauthenticated attackers replay valid id\_tokens to authenticate as any user, exploit requires use\_id\_token\_parser\_v2 plugin option enabled.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.52% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-104759)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

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

Published

10 October 2026

Updated

15 October 2026

Weakness

[CWE-287](https://cwe.mitre.org/data/definitions/287.html)

## Vendor fix

Update to a version later than 44.1 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-104759](https://nvd.nist.gov/vuln/detail/CVE-2026-104759)
- [https://www.wordfence.com/threat-intel/vulnerabilities/id/aad7ddac-ed12-4263-8e68-64b1fca8dfad?source=cve](https://www.wordfence.com/threat-intel/vulnerabilities/id/aad7ddac-ed12-4263-8e68-64b1fca8dfad?source=cve)
- [https://plugins.trac.wordpress.org/browser/wpo365-login/tags/44.1/Services/Id\_Token\_Service.php#L107](https://plugins.trac.wordpress.org/browser/wpo365-login/tags/44.1/Services/Id_Token_Service.php#L107)
- [https://plugins.trac.wordpress.org/browser/wpo365-login/tags/44.1/Services/Id\_Token\_Service\_Deprecated.php#L110](https://plugins.trac.wordpress.org/browser/wpo365-login/tags/44.1/Services/Id_Token_Service_Deprecated.php#L110)
- [https://plugins.trac.wordpress.org/browser/wpo365-login/tags/44.1/Services/Nonce\_Service.php#L72](https://plugins.trac.wordpress.org/browser/wpo365-login/tags/44.1/Services/Nonce_Service.php#L72)
- [https://plugins.trac.wordpress.org/browser/wpo365-login/tags/44.1/Services/Router\_Service.php#L275](https://plugins.trac.wordpress.org/browser/wpo365-login/tags/44.1/Services/Router_Service.php#L275)
- [https://plugins.trac.wordpress.org/changeset/3727410/wpo365-login](https://plugins.trac.wordpress.org/changeset/3727410/wpo365-login)
- [https://plugins.trac.wordpress.org/changeset?reponame=&new=3727410%40wpo365-login%2Ftags%2F45.0&old=3682496%40wpo365-login%2Ftags%2F44.1](https://plugins.trac.wordpress.org/changeset?reponame=&new=3727410%40wpo365-login%2Ftags%2F45.0&old=3682496%40wpo365-login%2Ftags%2F44.1)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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