CVE-2026-28149 CRITICAL

CVE-2026-28149: WordPress Headless Single Sign On plugin <= 1.6 - PHP Object Injection vulnerability

Vendor Miniorange

Product Headless Single Sign On

Weakness CWE-502 · Unsafe deserialization

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 PHP Object Injection in Headless Single Sign On <= 1.6 versions.

Explanation of Vulnerability in Simple Terms

02Summary

Headless Single Sign On versions 1.6 and earlier contain a deserialization vulnerability that allows unauthenticated attackers to execute arbitrary code on the server. The vulnerability requires no user interaction and can be exploited over the network. An attacker can gain complete control of the affected system, including reading sensitive data, modifying content, and disrupting service.

What an attacker can do

03Attacker Capabilities

Run arbitrary code on the server without authentication, gaining full control of the site.

Potential impact on your site

04Site Impact

Complete compromise of the site and server. Attackers can steal data, modify content, install backdoors, or take the site offline.

Conditions required to exploit

05Prerequisites

Network access to the vulnerable application. 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-2026-28149 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/502.html AskarLabs — CWE-502 write-up Deserialization of Untrusted Data

Related vulnerabilities

Identifiers

CVE CVE-2026-28149

CWE CWE-502

CVSS 9.8 / CRITICAL

Affected versions