CVE-2026-10865

Cost Calculator Builder <= 4.0.11 - Unauthenticated Sensitive Information Exposure of Payment Gateway Secret Keys

The Cost Calculator Builder plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 4.0.11 via the (template body). This makes it possible for unauthenticated attackers to extract the plaintext Stripe secret key, Razorpay secret key, and PayPal client_secret embedded in the page source of any page containing a calculator, enabling full control of the merchant's payment gateway accounts. This exposure only occurs when the 'use in all calculators' option is enabled for one or more payment gateways in the plugin's global settings.

We have discovered 744 live websites that are affected by CVE-2026-10865.

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Affected Software

Product  Cost Calculator Builder
Category Wordpress Plugins
Vulnerable Domains744 live websites (100% of Cost Calculator Builder install base)
Vulnerable Versions
  • from 0 through 4.0.11
Vulnerable Versions Count83 versions ( 97% of all versions)


Common Weakness Enumeration

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor



Details

  • Published - Jul 11, 2026
  • Updated - Jul 13, 2026

Credits

  • oper999 (finder)

Website Distribution by Country

Number of websites using CVE-2026-10865
United States165 websites


Germany71 websites
Russia70 websites
GB49 websites
France40 websites
Poland25 websites
Netherlands23 websites
Italy17 websites
Canada17 websites
Cyprus17 websites

Website Distribution by TLD

Number of websites using CVE-2026-10865
.com267 websites
.ru63 websites
.de40 websites
.co.uk34 websites
.pl22 websites
.nl22 websites
.com.au17 websites
.fr16 websites
.net13 websites
.it12 websites

Vulnerable Versions

Vulnerable versions are highlighted in red

Websites affected by CVE-2026-10865

Top websites that are affected by CVE-2026-10865. Please click on the "Contact us" link to get more information.
DomainCountryRankContacts
********.app United States***,***
************.org United States***,***
*******.com United States***,***
**********.to United States***,***
********.com United States***,***
**********.com Canada***,***
*********.com France*,***,***
**************.eu Romania*,***,***
*******.com United States*,***,***
************.xn--p1ai Russia*,***,***
See full domain list

FAQ

CVE-2026-10865 is Exposure of Sensitive Information to an Unauthorized Actor in Cost Calculator Builder
A total of 744 websites have been identified as vulnerable to CVE-2026-10865, based on global website indexing conducted by WebTechSurvey.
The Cost Calculator Builder is affected by the CVE-2026-10865 vulnerability.
Cost Calculator Builder versions up to and including 4.0.11 are vulnerable to CVE-2026-10865.

References