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Vulnerabilities

Vulnerability · CVE-2026-9189

The Contact Form 7 – PayPal & Stripe Add-on plugin for WordPress is vulnerable to Payment Bypass via Insufficient Verification of Data Authenticity in all versions up…

Published May 29, 2026 · catalog updated Jul 21, 2026 · the affected product

Last checked Oct 23, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-9189. EPSS is 0.25%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.25%
Remediation
Version ranges on file
Affected products
stated named in the record

The Contact Form 7 – PayPal & Stripe Add-on plugin for WordPress is vulnerable to Payment Bypass via Insufficient Verification of Data Authenticity in all versions up to, and including, 2.4.9. Although correctly validates IPN authenticity by posting back to PayPal with , it fails to compare the IPN payload's (payment amount), , or fields against the corresponding stored order values before passing the attacker-controlled field directly to , which marks the order completed after only an integer cast with no amount verification. This makes it possible for unauthenticated attackers to mark arbitrary high-value pending orders as fully paid by making a minimal real PayPal payment and crafting an IPN whose parameter references the targeted order, effectively completing purchases without tendering the required payment amount.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated named in the record<= 2.4.9

How to fix CVE-2026-9189

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-9189. EPSS is 0.25%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Compare what you have installed with named in the record <= 2.4.9. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-345: Insufficient Verification of Data Authenticity. EPSS 0.25%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 29, 2026 · NIST NVD

    Detected

    The Contact Form 7 – PayPal & Stripe Add-on plugin for WordPress is vulnerable to Payment Bypass via Insufficient Verification of Data Authenticity in all versions up to, and including, 2.4.9. Although correctly validates IPN authenticity by posting back to PayPal with , it fails to compare the IPN payload's (payment amount), , or fields against the corresponding stored order values before passing

  2. Jul 21, 2026 · NIST NVD

    Updated

    The Contact Form 7 – PayPal & Stripe Add-on plugin for WordPress is vulnerable to Payment Bypass via Insufficient Verification of Data Authenticity in all versions up to, and including, 2.4.9. Although correctly validates IPN authenticity by posting back to PayPal with , it fails to compare the IPN payload's (payment amount), , or fields against the corresponding stored order values before passing

Sources

  • CVE.orgVulnerability recordCVE-2026-9189

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-9189

    30-day exploitation probability 0.25%

    first.org
  • NIST NVDVulnerability recordCVE-2026-9189

    The Contact Form 7 – PayPal & Stripe Add-on plugin for WordPress is vulnerable to Payment Bypass via Insufficient Verification of Data Authenticity in all versions up to, and including, 2.4.9. Although correctly validates IPN authenticity by posting b

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 17, 2026
  • NIST NVDOct 17, 2026