# CVE-2022-4120: Stop Spammers Security < 2022.6 - Unauthenticated PHP Object Injection

> Unauthenticated attackers can achieve code execution via PHP object injection in the Stop Spammers Security WordPress plugin when CAPTCHA is enabled.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Dec 2022
- **Updated:** 14 Apr 2025
- **Also known as:** GHSA-7x93-m29h-6j9q

## What is CVE-2022-4120?

CVE-2022-4120 is a critical unsafe deserialization vulnerability in Unknown Stop Spammers Security | Block Spam Users, Comments, Forms, published on 26 Dec 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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

## Which versions are affected by CVE-2022-4120?

It affects 1 product.


Products: Trumani Stop Spammers.

## How do I fix CVE-2022-4120?

No fix has been published for CVE-2022-4120 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-4120 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-4120 exists.

## Other vulnerabilities in Unknown Stop Spammers Security | Block Spam Users, Comments, Forms

- [CVE-2023-2488](https://insights.sbomify.com/CVE-2023-2488/): Stop Spammers Security < 2023 - Reflected XSS (medium 6.1)
- [CVE-2021-24245](https://insights.sbomify.com/CVE-2021-24245/): Stop Spammers < 2021.9 - Reflected Cross-Site Scripting (XSS) (medium 6.1)
- [CVE-2021-24517](https://insights.sbomify.com/CVE-2021-24517/): Stop Spammers Security < 2021.18 - Authenticated Stored XSS (medium 5.4)
- [CVE-2023-2489](https://insights.sbomify.com/CVE-2023-2489/): Stop Spammers Security < 2023 - Admin+ Stored XSS (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-4120 and fix it if it is affected.

What it is: CVE-2022-4120 is a critical unsafe deserialization vulnerability in Unknown Stop Spammers Security | Block Spam Users, Comments, Forms, published on 26 Dec 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-4120 exists.

Affected product: Unknown Stop Spammers Security | Block Spam Users, Comments, Forms. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2022-4120/ (Markdown: https://insights.sbomify.com/CVE-2022-4120/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-4120
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-4120
- OSV: https://osv.dev/vulnerability/CVE-2022-4120

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-4120/
Summaries are generated and may contain mistakes; the official description above is the record.