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CVE-2026-62108 – Unauthenticated Authentication Bypass – miniOrange Headless Single Sign On WordPres

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Summary

CVE-2026-62108 is a critical, unauthenticated broken-authentication vulnerability in the miniOrange Headless Single Sign On WordPress plugin (package headless-single-sign-on), affecting all versions up to and including 1.7.0. The flaw is classified as CWE-290 (Authentication Bypass by Spoofing) and allows a remote, unauthenticated attacker to bypass the plugin’s authentication mechanism, potentially gaining unauthorized access to protected accounts. It carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: The plugin’s SSO authentication logic is susceptible to identity spoofing (CWE-290 / CAPEC-151), allowing an attacker to be treated as authenticated without presenting valid credentials.
  • Trigger conditions: No authentication or user interaction is required; the vulnerable authentication logic is reachable directly over the network on any site running an affected version of the plugin.
  • Attack vector: Network-based (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: Full compromise of confidentiality, integrity, and availability (C:H/I:H/A:H) — successful exploitation can allow an attacker to bypass authentication entirely, which in SSO contexts can translate to unauthorized access to user or administrator sessions on the WordPress site.

Affected software

  • miniOrange Headless Single Sign On WordPress plugin (package: headless-single-sign-on): all versions ≤ 1.7.0
  • Fixed in version 1.7.1 and later

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update the Headless Single Sign On plugin to version 1.7.1 or later, which resolves the authentication bypass.
  • If immediate patching is not possible:
    • Restrict or disable access to the plugin’s SSO authentication endpoints from untrusted networks until the update can be applied.
    • Monitor authentication logs for anomalous or unexpected login/session-creation activity that does not correlate with normal SSO identity provider flows.
    • Consider temporarily deactivating the plugin on internet-facing WordPress sites if patching cannot be performed promptly, given the unauthenticated, network-exploitable nature of the flaw.

References

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