CVE-2026-66563: WordPress Windsor theme <= 2.10 - PHP Object Injection vulnerability

Critical severity · published Oct 10, 2026

CVE-2026-66563

WordPress Windsor theme <= 2.10 - PHP Object Injection vulnerability

9.8

CVSS

0.3%

EPSS

On KEV

Description

Unauthenticated PHP Object Injection in Windsor <= 2.10 versions.

CVSS vector

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

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

None

Confidentiality

High

Integrity

High

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.3% · higher than 23% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Windsor · ThemeREX

through 2.10 · source: vendor

Affected product

Windsor

ThemeREX

All Windsor CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-66563

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-66563

vdb-entry

https://patchstack.com/database/wordpress/theme/windsor/vulnerability/wordpress-windsor-theme-2-10-php-object-injection-vulnerability?_s_id=cve