CVE-2022-4120
CVSS v3
9.8
CRITICAL
EPSS Score
18.1 %
exploit probability, as of 2026-10-05
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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?
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
Is CVE-2022-4120 actively exploited?
Active exploitation of CVE-2022-4120 has not been confirmed. Its EPSS score was 18.1% on 2026-10-05, 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).
Is CVE-2022-4120 affecting your environment?
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