What is CVE-2023-1405?

CVE-2023-1405 is a high-severity vulnerability in Strategy11 Formidable Forms, classified under Deserialization of Untrusted Data. CVSS score: 7.5/10. Published 2024-01-16.

How severe is CVE-2023-1405?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2023-1405 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Deserialization in Strategy11 Formidable Forms

CVE-2023-1405

The Formidable Forms WordPress plugin before 6.2 unserializes user input, which could allow anonymous users to perform PHP Object Injection when a suitable gadget is present.

Vulnerability class: Insecure Deserialization

Published 2024-01-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.007 (51.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Strategy11 Formidable Forms
Formidable Forms — versions 0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

Public proof-of-concept exploits

References

wpscan.com/vulnerability/8c727a31-ff65-4472-8191-b1becc08192a/ (Exploit, technical-description, Third Party Advisory, exploit, vdb-entry)

Frequently asked questions

What is CVE-2023-1405?: CVE-2023-1405 is a high-severity vulnerability in Strategy11 Formidable Forms, classified under Deserialization of Untrusted Data. CVSS score: 7.5/10. Published 2024-01-16.
How severe is CVE-2023-1405?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2023-1405 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.