Critical severity · published Mar 25, 2026
CVE-2026-27084
WordPress Buisson theme <= 1.1.11 - PHP Object Injection vulnerability
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
Deserialization of Untrusted Data vulnerability in ThemeREX Buisson buisson allows Object Injection.This issue affects Buisson: from n/a through <= 1.1.11.
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)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BU
Buisson · ThemeREX
through 1.1.11 · source: vendor