CRITICAL

CVE-2022-4120

CVSS v3

9.8

CRITICAL

EPSS Score

18.1 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2022-4120 yet.

Full record on NVD

Description

The Stop Spammers Security | Block Spam Users, Comments, Forms WordPress plugin before 2022.6 passes base64 encoded user input to the unserialize() PHP function when CAPTCHA are used as second challenge, which could lead to PHP Object injection if a plugin installed on the blog has a suitable gadget chain

Technical details

Published: 2022-12-26

Frequently asked questions

What is CVE-2022-4120?

Is CVE-2022-4120 actively exploited?

Active exploitation of CVE-2022-4120 has not been confirmed. Its EPSS score was 18.1% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-4120?

CVE-2022-4120 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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