CVE-2026-57807 Overview
CVE-2026-57807 is an authentication bypass vulnerability in the miniOrange OAuth Single Sign On - SSO (OAuth Client) plugin for WordPress. The flaw allows attackers to abuse the password recovery flow as an alternate authentication channel, bypassing normal login controls [CWE-288]. All plugin versions from n/a through 38.5.8 are affected. The vulnerability is remotely exploitable over the network without prior authentication or user interaction, exposing WordPress sites that rely on the plugin for federated login to full account takeover.
Critical Impact
Unauthenticated attackers can gain access to arbitrary user accounts, including administrators, by exploiting the plugin's password recovery path.
Affected Products
- miniOrange OAuth Single Sign On - SSO (OAuth Client) plugin for WordPress
- All versions from n/a through 38.5.8
- WordPress sites using this plugin for OAuth-based authentication
Discovery Timeline
- 2026-07-10 - CVE-2026-57807 published to NVD
- 2026-07-13 - Last updated in NVD database
Technical Details for CVE-2026-57807
Vulnerability Analysis
The plugin implements OAuth-based single sign-on for WordPress and also exposes a password recovery workflow. The recovery workflow functions as an alternate authentication channel that does not enforce the identity verification checks applied to the primary login path. Attackers can invoke this alternate path to obtain authenticated access to accounts belonging to other users.
Because the primary OAuth login flow is bypassed entirely, protections such as identity provider policies, MFA at the IdP, and OAuth state validation do not apply. The result is broken authentication that maps directly to [CWE-288]: Authentication Bypass Using an Alternate Path or Channel.
Root Cause
The root cause is insufficient validation within the plugin's password recovery handler. The recovery endpoint accepts requests and issues authenticated sessions or password resets without verifying that the requester controls the target identity. Because the endpoint is reachable from the network and requires no privileges, any anonymous visitor can trigger it against a chosen account.
Attack Vector
An unauthenticated remote attacker sends crafted HTTP requests to the plugin's password recovery endpoints on the target WordPress site. By manipulating parameters that identify the target user, the attacker triggers the recovery workflow against an arbitrary account, including administrators. Successful exploitation yields full access to the account and, through the WordPress admin, to the underlying site.
No verified proof-of-concept has been published. For technical specifics, see the Patchstack Vulnerability Report.
Detection Methods for CVE-2026-57807
Indicators of Compromise
- Unexpected password reset events for administrator or privileged accounts in WordPress logs.
- Successful logins from unfamiliar IP addresses or geographies immediately following a password recovery request.
- HTTP requests to miniOrange OAuth plugin recovery endpoints from unauthenticated sources.
- New administrator accounts, plugin installations, or theme edits shortly after a recovery event.
Detection Strategies
- Enable WordPress audit logging and alert on password reset and role change events tied to the miniOrange OAuth plugin.
- Correlate recovery endpoint access with subsequent session creation to identify bypass attempts.
- Inspect web server logs for anomalous request patterns targeting plugin paths under miniorange-oauth-oidc-single-sign-on.
Monitoring Recommendations
- Monitor wp-login.php, admin-ajax.php, and plugin-specific REST routes for spikes in unauthenticated requests.
- Alert on high-privilege account logins that were preceded by a password recovery request.
- Track file integrity of the plugin directory and the wp-content/plugins tree for post-exploitation changes.
How to Mitigate CVE-2026-57807
Immediate Actions Required
- Update the miniOrange OAuth Single Sign On - SSO (OAuth Client) plugin to a version later than 38.5.8 as soon as the vendor releases a fix.
- If no fixed version is available, deactivate and remove the plugin until a patched release is deployed.
- Force password resets for all WordPress accounts, especially administrators, after patching.
- Review audit logs for signs of prior exploitation dating back to plugin installation.
Patch Information
At the time of NVD publication, the vulnerability affects all versions up to and including 38.5.8. Consult the Patchstack Vulnerability Report and the miniOrange vendor advisory channels for the fixed release.
Workarounds
- Restrict access to WordPress administrative and plugin recovery endpoints using a web application firewall or IP allowlisting.
- Disable the plugin's password recovery feature via configuration if the workflow is not required.
- Enforce multi-factor authentication at the WordPress layer so that account takeover requires more than a recovered password.
- Rotate credentials and OAuth client secrets after remediation to invalidate any material captured during exploitation.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
