CVE-2026-4986
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
The WPForms WordPress plugin before version 1.10.0.5 does not verify the authenticity of incoming PayPal webhook events before processing them, allowing unauthenticated attackers to forge webhook payloads and manipulate the payment state of arbitrary transactions.
Risk Assessment
The risk involves potential payment fraud, which could lead to financial losses, unauthorized refunds, or order status changes without actual payment.
Recommendation
Immediately update the WPForms plugin to version 1.10.0.5 or later and implement server-side verification of PayPal webhook signatures.
Other vulnerabilities in WPForms
See all- CVE-2026-15782Medium
WPForms plugin for WordPress up to 2.0.0.1 has a Stored XSS vulnerability via the data-sitekey attribute of OptinMonster integration. Authenticated attackers with contributor-level access can inject scripts that execute on page view.
- CVE-2026-12127Medium
The WPForms plugin for WordPress up to version 1.10.2 is vulnerable to CRLF Injection, allowing email header injection. The flaw occurs due to improper handling of the Reply-To display name, enabling unauthenticated attackers to inject arbitrary headers like Bcc into outgoing notification emails.
- CVE-2026-48835High
In WPForms versions <= 1.10.0.4, there is an issue with unauthenticated access to the contact form, leading to broken access control.
- CVE-2026-7792Medium
The WPForms plugin for WordPress up to version 1.10.0.1 does not properly verify the authenticity of PayPal Commerce webhooks. Unauthenticated attackers can forge webhook events and modify payment records, e.g., reactivate a cancelled subscription.
Original NVD description (English source)
The WPForms WordPress plugin before 1.10.0.5 does not verify the authenticity of incoming PayPal webhook events before processing them, allowing unauthenticated attackers to forge webhook payloads and manipulate the payment state of arbitrary transactions.