CVE-2026-28008 CRITICAL

CVE-2026-28008: WordPress OAuth Single Sign On – SSO (OAuth Client) plugin <= 7.0.0 - Broken Authentication vulnerability

Vendor Miniorange

Product OAuth Single Sign On – SSO (OAuth Client)

Weakness CWE-290

Published August 13, 2026

Last update August 13, 2026

View on NVD All CVEs

CVSS base score

9.8/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction None

Confidentiality High

Integrity High

CVSS vector

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

What the vulnerability does

01Description

Unauthenticated Broken Authentication in OAuth Single Sign On – SSO (OAuth Client) <= 7.0.0 versions.

Explanation of Vulnerability in Simple Terms

02Summary

The OAuth Single Sign On plugin for miniOrange contains an authentication bypass vulnerability that allows attackers to spoof authentication tokens without valid credentials. An attacker can gain unauthorized access to any user account, including administrator accounts, by manipulating the OAuth authentication flow. This affects all versions up to 7.0.0 and requires no user interaction or special privileges to exploit.

What an attacker can do

03Attacker Capabilities

Bypass authentication and log in as any user, including site administrators, without knowing their password.

Potential impact on your site

04Site Impact

Complete compromise of site security; attackers can access all user accounts and administrative functions.

Conditions required to exploit

05Prerequisites

Network access only; no authentication or user interaction required.

Key dates

06Disclosure timeline

August 13, 2026 CVE published

External resources

07References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-28008 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/290.html AskarLabs — CWE-290 write-up Authentication Bypass by Spoofing

Related vulnerabilities

Identifiers

CVE CVE-2026-28008

CWE CWE-290

CVSS 9.8 / CRITICAL

Affected versions