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Fencer Intel
critical 9.8

CVE-2022-4120 in the critical feed json

Stop Spammers Security < 2022.6 - Unauthenticated PHP Object Injection

published 3y ago modified 4mo ago also EUVD-2022-51487

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
18.1%
EPSS 18.1% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

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

Patch / fix

  • Unknown Stop Spammers Security | Block Spam Users, Comments, Forms 2022.6

Is CVE-2022-4120 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
last yr.

Exploit prediction

18.12% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • wpscan.com https://wpscan.com/vulnerability/e8bb79db-ef77-43be-b449-4c4b5310eedf referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Unknown Stop Spammers Security | Block Spam Users, Comments, Forms

Classification

Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.