What is CVE-2023-4666?

CVE-2023-4666 is a critical-severity vulnerability in 10web Form Maker, classified under CWE-434 UNRESTRICTED UPLOAD OF FILE WITH DANGEROUS TYPE. CVSS score: 9.8/10. Published 2023-10-16.

How severe is CVE-2023-4666?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2023-4666 known to be exploited?

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

Vulnerability in 10web Form Maker

CVE-2023-4666

The Form Maker by 10Web WordPress plugin before 1.15.20 does not validate signatures when creating them on the server from user input, allowing unauthenticated users to create arbitrary files and lead to RCE

Published 2023-10-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 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.

EPSS exploit prediction

EPSS: 0.033 (88.1th percentile), scored 2026-10-05.

Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.033 · newest: 0.033 · change: 0.000

Affected products

10web Form Maker
Form Maker By 10web — versions 0

Public proof-of-concept exploits

References

wpscan.com/vulnerability/c6597e36-02d6-46b4-89db-52c160f418be (Exploit, technical-description, Third Party Advisory, exploit, vdb-entry)

Frequently asked questions

What is CVE-2023-4666?: CVE-2023-4666 is a critical-severity vulnerability in 10web Form Maker, classified under CWE-434 UNRESTRICTED UPLOAD OF FILE WITH DANGEROUS TYPE. CVSS score: 9.8/10. Published 2023-10-16.
How severe is CVE-2023-4666?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2023-4666 known to be exploited?: 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.