CVE-2026-28149: WordPress Headless Single Sign On plugin <= 1.6 - PHP Object Injection vulnerability
Published Aug 13, 2026
·Updated
Unauthenticated PHP Object Injection in Headless Single Sign On <= 1.6 versions.
Affected Software
1 affected component
WordPress Headless Single Sign On plugin<=1.6
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
WordPress Headless Single Sign On pluginto a version that resolves this vulnerability.Fixed in 1.6.1
Event History
Aug 13, 2026
CVE Published
via MITRE·01:36 PM
Data Sourced
via MITRE·01:36 PM
RemedyDescriptionSeverityWeakness
Frequently Asked Questions
1
What is the severity of CVE-2026-28149?
CVE-2026-28149 has a critical severity rating of 9.8.
2
What exploit risk does CVE-2026-28149 present?
CVE-2026-28149 presents a risk score of 86, indicating a significant likelihood of exploitation.
3
How do I fix CVE-2026-28149?
To fix CVE-2026-28149, update the WordPress Headless Single Sign On plugin to version 1.6.1 or later.
4
What type of vulnerability is CVE-2026-28149?
CVE-2026-28149 is a PHP Object Injection vulnerability that allows unauthenticated users to exploit the plugin.
5
Which versions of the plugin are affected by CVE-2026-28149?
CVE-2026-28149 affects versions of the WordPress Headless Single Sign On plugin that are 1.6 or earlier.