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PatchSiren cyber security CVE debrief

CVE-2026-4986 WPForms CVE debrief

CVE-2026-4986 is a MEDIUM-severity vulnerability in the WPForms WordPress plugin. The plugin did not properly validate the authenticity of incoming PayPal webhook events prior to processing them. This could allow an unauthenticated attacker to forge webhook payloads and manipulate the payment state of arbitrary transactions.

Vendor
WPForms
Product
WPForms WordPress plugin
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-09
Advisory published
2026-06-09
Advisory updated
2026-06-09

Who should care

Users of the WPForms WordPress plugin, particularly those who use PayPal webhooks for payment processing, should be aware of this vulnerability and take steps to mitigate it.

Technical summary

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. The vulnerability has a CVSS score of 5.3 and is classified as CWE-862.

Defensive priority

MEDIUM

Recommended defensive actions

  • Update the WPForms plugin to version 1.10.0.5 or later.
  • Verify the authenticity of incoming PayPal webhook events before processing them.

Evidence notes

The CVE record was published on [resourceLinkAnnotations:cve-org] and additional details can be found on [resourceLinkAnnotations:nvd]. A source reference is available at [resourceLinkAnnotations:ref-4].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-4986 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-4986

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-4986 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-4986

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.