External risk intelligence

miniOrange SSO OAuth Client Authentication Bypass for Password Recovery.

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-57807

This vulnerability affects an OAuth Single Sign-On (SSO) plugin for WordPress. Such plugins are typically deployed to facilitate authentication for web applications and user portals, which are commonly exposed to the public internet to manage user access, making the authentication endpoint a reachable service.

Authentication Bypass

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This CVE involves an authentication bypass vulnerability in an OAuth Single Sign-On (SSO) product, potentially allowing unauthorized access for password recovery. The technology affected is an OAuth Client used for Single Sign-On. The main concern is confirming relevance and exposure due to its potential to bypass authentication mechanisms.

Bypass for password recovery.
Affects authentication; critical impact possible.
Confirm relevance and exposure to affected systems.

Attack Path

How an attacker could exploit the issue

An attacker can exploit this vulnerability by targeting the password recovery mechanism through an alternate path or channel. This bypasses normal authentication, allowing an attacker to gain unauthorized access to user accounts, potentially leading to severe consequences.

No authentication required to access.
Triggered via password recovery.
Leads to full account compromise.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an attacker to bypass authentication and exploit the password recovery mechanism, potentially affecting user accounts and sensitive information when the OAuth Single Sign-On client is exposed.

User account access could be compromised.
Attackers could exploit password recovery.
Unauthorized access and data breaches may occur.

Operational Fix

Recommended remediation, mitigation, and detection steps

Teams responsible for managing WordPress instances and associated authentication plugins should address this vulnerability. The first practical step is to inventory all WordPress sites using the miniOrange OAuth Single Sign-On plugin, confirm their internet reachability, and identify the business-critical applications they support. This will help in prioritizing remediation efforts and coordinating with the relevant application owners or infrastructure teams.

Identify affected WordPress instances.
Verify internet exposure and business criticality.
Plan remediation with application owners.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the miniOrange OAuth Single Sign-On (SSO) plugin?

This software is a WordPress plugin designed to let users log into their accounts using external OAuth or OpenID Connect providers. By acting as an OAuth client, it streamlines authentication across web applications and portals, replacing traditional login forms with third-party verification services to manage user identity.

How does CVE-2026-57807 allow an authentication bypass?

This vulnerability is classified as CWE-288, Authentication Bypass Using an Alternate Path or Channel. Essentially, it means the plugin has a logic flaw where an attacker can use a different route than the intended login process to interact with the password recovery system, effectively tricking the software into granting account access without providing valid credentials.

What actions trigger this authentication flaw?

The vulnerability is triggered by specifically targeting the plugin's password recovery functionality. It does not require a user to be logged in or possess existing credentials to execute. Normal, authorized password resets performed by legitimate users through the standard interface do not constitute an attack, but the flaw creates a path that ignores these standard verification requirements.

Is my system at risk according to Halo Surface Signal?

Halo Surface Signal labels this as a likely risk because the plugin is typically used for public-facing web applications or user portals. Since these endpoints must be reachable over the internet to function as an SSO portal, they are inherently exposed to external network traffic, making it easier for an attacker to reach and exploit the vulnerable recovery path.

What should I do if I use this plugin?

Begin by creating an inventory of all WordPress sites where this plugin is currently installed. Once identified, determine which of those instances are accessible from the internet and support sensitive business operations. This allows you to prioritize high-impact sites for updates and communicate clearly with the specific teams or owners responsible for those environments.

References

patchstack.com/database/wordpress/plugin/miniorange-oauth-oidc-singl…

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.