Medium severity · published Oct 21, 2026
CVE-2026-104641
Simple Shopping Cart < 5.3.3 - Unauthenticated Payment Bypass via Unverified PayPal IPN Recipient
5.3
CVSS
0.1%
EPSS
No
On KEV
Description
The Simple Shopping Cart WordPress plugin before 5.3.3 does not verify that a PayPal payment notification is for a payment received by the site owner's PayPal account in its default configuration, allowing unauthenticated attackers to have their orders marked as paid using a payment made to an account they control.
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)0.1% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SS
Simple Shopping Cart ·
before 5.3.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-104641
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-104641
wpscan.com
https://wpscan.com/vulnerability/8227f34e-d2ae-4eb4-9984-aeb07d93ed25/
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Simple Shopping Cart 5.1.3 - 5.3.2 - Contributor+ Price Manipulation via Price Verification Bypass