High severity · published Aug 13, 2026
CVE-2026-28176
WordPress Booking Activities plugin <= 1.18.4 - PHP Object Injection vulnerability
8.8
CVSS
0.5%
EPSS
No
On KEV
Description
Unauthenticated PHP Object Injection in Booking Activities <= 1.18.4 versions.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BA
Booking Activities · Booking Activities Team
through 1.18.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28176
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-28176
patchstack.com
https://patchstack.com/database/wordpress/plugin/booking-activities/vulnerability/wordpress-booking-activities-plugin-1-18-4-php-object-injection-vulnerability?_s_id=cve
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