CVE-2026-2890

Formidable Forms <= 6.28 - Missing Authorization to Unauthenticated Payment Integrity Bypass via PaymentIntent Reuse

The Formidable Forms plugin for WordPress is vulnerable to a payment integrity bypass in all versions up to, and including, 6.28. This is due to the Stripe Link return handler (`handle_one_time_stripe_link_return_url`) marking payment records as complete based solely on the Stripe PaymentIntent status without comparing the intent's charged amount against the expected payment amount, and the `verify_intent()` function validating only client secret ownership without binding intents to specific forms or actions. This makes it possible for unauthenticated attackers to reuse a PaymentIntent from a completed low-value payment to mark a high-value payment as complete, effectively bypassing payment for goods or services.

We have discovered 59,936 live websites that are affected by CVE-2026-2890.

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Affected Software

Product  Formidable Forms
Category Wordpress Plugins
Vulnerable Domains59,936 live websites (87% of Formidable Forms install base)
Vulnerable Versions
  • from 0 through 6.28
Vulnerable Versions Count237 versions ( 100% of all versions)


Common Weakness Enumeration

CWE-862 Missing Authorization



Details

  • Published - Mar 13, 2026
  • Updated - Apr 8, 2026

Credits

  • Andrés Cruciani (finder)

Website Distribution by Country

Number of websites using CVE-2026-2890
United States27,583 websites


GB4,150 websites
Germany4,143 websites
France3,852 websites
Canada2,514 websites
Netherlands2,510 websites
Australia1,699 websites
Italy1,342 websites
Switzerland1,242 websites
South Africa1,017 websites

Website Distribution by TLD

Number of websites using CVE-2026-2890
.com29,841 websites
.org3,980 websites
.co.uk2,846 websites
.de2,462 websites
.nl2,426 websites
.fr1,865 websites
.com.au1,607 websites
.ca1,448 websites
.net1,206 websites
.ch1,047 websites

Vulnerable Versions

Vulnerable versions are highlighted in red

Websites affected by CVE-2026-2890

Top websites that are affected by CVE-2026-2890. Please click on the "Contact us" link to get more information.
DomainCountryRankContacts
*********.com United States***
**************.com Canada*,***
********.com United States*,***
************.**.**.uk GB**,***
**************.com United States**,***
**********.me United States**,***
************.uk GB**,***
***********.com United States**,***
*******.org United States**,***
**********.com Netherlands**,***
See full domain list

FAQ

CVE-2026-2890 is Missing Authorization in Formidable Forms
A total of 59,936 websites have been identified as vulnerable to CVE-2026-2890, based on global website indexing conducted by WebTechSurvey.
The Formidable Forms is affected by the CVE-2026-2890 vulnerability.
Formidable Forms versions up to and including 6.28 are vulnerable to CVE-2026-2890.