CVE-2023-28782Network attack vector

Unauthenticated object injection via unserialized list input

Published Dec 20, 2023 · Updated Apr 28, 2026

PHP object injection in Gravity Forms 2.7.3 and earlier allows remote attackers to inject arbitrary objects through a submitted list field. The get_field_input and legacy handlers pass the field's value directly to maybe_unserialize without validating or restricting serialized classes. A default installation is exposed when a published form contains a list field; further file deletion, data access, or code execution requires a usable POP chain from another installed plugin or theme.

CVSS severity9.8
Critical
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

PHP object injection in Gravity Forms 2.7.3 and earlier allows remote attackers to inject arbitrary objects through a submitted list field. The get_field_input and legacy handlers pass the field's value directly to maybe_unserialize without validating or restricting serialized classes. A default installation is exposed when a published form contains a list field; further file deletion, data access, or code execution requires a usable POP chain from another installed plugin or theme.

The record

CVE
CVE-2023-28782
Published
Dec 20, 2023
Updated
Apr 28, 2026
Vendor
Rocketgenius
Product
Gravity Forms
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=n/a <=2.7.3 changes=[{"at":"2.7.4","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rocketgenius · Gravity Formsversion=n/a <=2.7.3 changes=[{"at":"2.7.4","status":"unaffected"}]

Published CVSS scores

8.3PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
9.8NVDCVSS: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.

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
Privilegesunauthenticated
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.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo