Medium severity · published Oct 28, 2026
CVE-2026-103331
UniPAY Payment Gateway For WooCommerce <= 2.3 - Unauthenticated Order Payment Forgery via Empty IPN Secret
New
5.3
CVSS
–
EPSS
No
On KEV
Description
The UniPAY Payment Gateway For WooCommerce WordPress plugin through 2.3 does not properly verify the authenticity of payment notifications, as their signature is checked against a merchant secret that is empty by default, allowing unauthenticated attackers to forge a valid notification and mark arbitrary orders as paid.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UP
UniPAY Payment Gateway For WooCommerce ·
through 2.3 · source: vendor
Affected product
UP
UniPAY Payment Gateway For WooCommerce