High severity · published Aug 6, 2026
CVE-2026-66705
WordPress Facebook for WordPress plugin <= 5.2.1 - Cross Site Scripting (XSS) vulnerability
7.1
CVSS
0.3%
EPSS
No
On KEV
Description
Unauthenticated Cross Site Scripting (XSS) in Facebook for WordPress <= 5.2.1 versions.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FF
Facebook for WordPress · Facebook
through 5.2.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-66705
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-66705
patchstack.com
https://patchstack.com/database/wordpress/plugin/official-facebook-pixel/vulnerability/wordpress-facebook-for-wordpress-plugin-5-2-1-cross-site-scripting-xss-vulnerability?_s_id=cve