# CVE-2022-4100: WP Cerber Security <= 9.4 - IP Protection Bypass

> Attackers can bypass IP blocking controls in WP Cerber Security by spoofing the X-Forwarded-For header, allowing blocked IPs to access the site.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 31 Aug 2024
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-m748-r53c-f6pp

## What is CVE-2022-4100?

CVE-2022-4100 is a medium-severity vulnerability in gioni WP Cerber Security, Anti-spam & Malware Scan, published on 31 Aug 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The WP Cerber Security plugin for WordPress is vulnerable to IP Protection bypass in versions up to, and including 9.4 due to the plugin improperly checking for a visitor's IP address. This makes it possible for an attacker whose IP address has been blocked to bypass this control by setting the X-Forwarded-For: HTTP header to an IP Address that hasn't been blocked.

Weakness: CWE-693 (Protection Mechanism Failure)

## Which versions are affected by CVE-2022-4100?

It affects 1 product.


Products: Wpcerber Cerber Security Antispam \& Malware Scan.

## How do I fix CVE-2022-4100?

No fix has been published for CVE-2022-4100 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-4100 being exploited?

There is no known exploitation of CVE-2022-4100 in the wild and no public exploit code.

## Other vulnerabilities in gioni WP Cerber Security, Anti-spam & Malware Scan

- [CVE-2016-10990](https://insights.sbomify.com/CVE-2016-10990/): Cross-site scripting in n/a (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-4100 and fix it if it is affected.

What it is: CVE-2022-4100 is a medium-severity vulnerability in gioni WP Cerber Security, Anti-spam & Malware Scan, published on 31 Aug 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-4100 in the wild and no public exploit code.

Affected product: gioni WP Cerber Security, Anti-spam & Malware Scan. 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-2022-4100/ (Markdown: https://insights.sbomify.com/CVE-2022-4100/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-4100
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-4100
- OSV: https://osv.dev/vulnerability/CVE-2022-4100

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-4100/
Summaries are generated and may contain mistakes; the official description above is the record.