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CVE-2026-62103 – Unauthenticated PHP Object Injection – Everest Forms WordPress Plugin ≤ 3.6.0

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Summary

CVE-2026-62103 is an unauthenticated PHP Object Injection vulnerability (CWE-502, Deserialization of Untrusted Data) affecting the Everest Forms WordPress plugin, versions up to and including 3.6.0. The plugin is a widely used drag-and-drop form builder, and the flaw allows a remote, unauthenticated attacker to submit crafted serialized data that the plugin deserializes without adequate restriction. The issue carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: the plugin deserializes untrusted, attacker-supplied input via PHP’s native object deserialization (CWE-502) without proper validation.
  • Trigger conditions: no authentication or user interaction is required; the vulnerable functionality is reachable over the network.
  • Attack vector: network-based (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: if a exploitable "POP chain" (Property-Oriented Programming chain) exists elsewhere in the WordPress installation (core, theme, or another plugin), successful exploitation can lead to arbitrary code execution, SQL injection, path traversal, denial of service, or other secondary impacts, in addition to full compromise of confidentiality, integrity, and availability of the affected site.

Affected software

  • Everest Forms (WordPress plugin) — versions ≤ 3.6.0
  • Fixed in version 3.6.1 and later

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update the Everest Forms plugin to version 3.6.1 or later, where the deserialization issue has been addressed.
  • If immediate patching is not possible: Restrict or monitor unauthenticated form submission endpoints, and review WAF/virtual-patching rules capable of blocking malicious serialized PHP payloads until the update can be applied.
  • After patching, review site and server logs for signs of exploitation attempts predating the update.

References

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