CVE-2022-4120

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-12-26. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 18%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
96.9%
KEV
Not listed

Published

December 26, 2022

Last Modified

April 14, 2025

Advisory Details (1)

Auto-updated Jun 16, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Stop Spammers Security < 2022.6 – Unauthenticated PHP Object Injection | CVE 2022-4120 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/e8bb79db-ef77-43be-b449-4c4b5310eedf

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 41× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 14:16 UTCEPSS rescore
  2. 2026-07-23 14:16 UTCEPSS rescore
  3. 2026-07-23 02:14 UTCEG score recompute
  4. 2026-07-22 23:01 UTCEG score recompute
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  69. 2026-05-25 09:45 UTCEG score recompute
  70. 2026-05-25 09:45 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2022-4120?
CVE-2022-4120 is a critical vulnerability published on December 26, 2022. 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…
When was CVE-2022-4120 disclosed?
CVE-2022-4120 was first published in the National Vulnerability Database on December 26, 2022, with the most recent update on April 14, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-4120 actively exploited?
CVE-2022-4120 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 96.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2022-4120?
CVE-2022-4120 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2022-4120?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-4120, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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