CVE-2024-4157Network attack vector

Authenticated object injection via unsafe dynamic-value deserialization

Published May 22, 2024 · Updated Apr 8, 2026

PHP object injection in WPManageNinja Fluent Forms 5.1.15 and earlier allows remote authenticated users to inject objects through form data. The extractDynamicValues function deserializes attacker-controlled dynamic values without blocking PHP object instantiation. Exploitation requires contributor-level access plus administrator-assigned View Form and Manage Form permissions, while file deletion, data access, or code execution also requires a usable POP chain.

CVSS severity7.5
High
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

PHP object injection in WPManageNinja Fluent Forms 5.1.15 and earlier allows remote authenticated users to inject objects through form data. The extractDynamicValues function deserializes attacker-controlled dynamic values without blocking PHP object instantiation. Exploitation requires contributor-level access plus administrator-assigned View Form and Manage Form permissions, while file deletion, data access, or code execution also requires a usable POP chain.

The record

CVE
CVE-2024-4157
Published
May 22, 2024
Updated
Apr 8, 2026
Vendor
Mahmudul Hasan Arif
Product
Fluent Forms
Classifications
CWE-502, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record updatedLatest update available in the CVE record.

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=0 <=5.1.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mahmudul Hasan Arif · Fluent Formsversion=0 <=5.1.15
WPManageNinja · Fluent Formsversion=0 <=5.1.15

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.5WordfenceCVSS:3.1/AV:N/AC:H/PR:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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