Medium severity · published Sep 9, 2026
CVE-2026-83537
WP Express Checkout < 2.5.0 - Unauthenticated Payment Bypass via wpec_process_empty_payment
5.3
CVSS
0.2%
EPSS
No
On KEV
Description
The WP Express Checkout WordPress plugin before 2.5.0 does not verify server-side that a payment was actually completed before marking an order as paid, allowing unauthenticated users to forge a completed order without paying.
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?
Exploit prediction (EPSS)0.2% · higher than 5% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WE
WP Express Checkout ·
before 2.5.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-83537
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-83537
wpscan.com
https://wpscan.com/vulnerability/02b39e4f-181d-4573-9175-bf5a6d71e531/
More from WP Express Checkout
5.3
CVE-2026-83533
WP Express Checkout < 2.4.9 - Unauthenticated Payment Bypass via wpec_process_payment