CVE-2026-28148 CRITICAL

CVE-2026-28148: WordPress Headless Single Sign On plugin <= 1.6 - Bypass Vulnerability vulnerability

Vendor Miniorange

Product Headless Single Sign On

Weakness CWE-347

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 Bypass Vulnerability in Headless Single Sign On <= 1.6 versions.

Explanation of Vulnerability in Simple Terms

02Summary

Headless Single Sign On versions up to 1.6 do not properly verify cryptographic signatures on authentication tokens. An attacker can forge valid-looking tokens without knowing the signing key, allowing them to impersonate any user including administrators. No authentication or user interaction is required to exploit this vulnerability.

What an attacker can do

03Attacker Capabilities

Forge authentication tokens to impersonate any user, including site administrators.

Potential impact on your site

04Site Impact

Complete compromise of user accounts and site administration through token forgery.

Conditions required to exploit

05Prerequisites

Network access to the site; 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-2026-28148 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/347.html AskarLabs — CWE-347 write-up Improper Verification of Cryptographic Signature

Related vulnerabilities

Identifiers

CVE CVE-2026-28148

CWE CWE-347

CVSS 9.8 / CRITICAL

Affected versions