CVE-2026-3300Known exploitationPublic exploitNetwork attack vector

Unauthenticated code execution via calculation-field eval injection

Published Mar 31, 2026 · Updated Mar 31, 2026

PHP code injection in Everest Forms Pro 1.9.12 and earlier allows remote attackers to execute arbitrary PHP code through public form submissions. The Calculation Addon's process_filter() wraps submitted string-field values in single quotes, appends them to generated PHP, and sends the result to eval() without PHP-context escaping. No authentication is required, but the targeted form must use Complex Calculation; successful exploitation provides server-side code execution.

CVSS severity9.8
Critical
EPSS probability39.16%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

PHP code injection in Everest Forms Pro 1.9.12 and earlier allows remote attackers to execute arbitrary PHP code through public form submissions. The Calculation Addon's process_filter() wraps submitted string-field values in single quotes, appends them to generated PHP, and sends the result to eval() without PHP-context escaping. No authentication is required, but the targeted form must use Complex Calculation; successful exploitation provides server-side code execution.

The record

CVE
CVE-2026-3300
Published
Mar 31, 2026
Updated
Mar 31, 2026
Vendor
WPEverest
Product
Everest Forms Pro
Classifications
CWE-94, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 2026Record updatedLatest update available in the CVE record.
  3. Apr 13, 2026Exploitation reportedMass exploitation of Complex Calculation injection

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=* <=1.9.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WPEverest · Everest Forms Proversion=* <=1.9.12

Published CVSS scores

9.8WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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