# CVE-2022-2939: WP Cerber Security <= 9.0 - User Enumeration Bypass

> Unauthenticated attackers can bypass user enumeration protections in WP Cerber Security to gather user information for targeted attacks.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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:** 6 Sep 2022
- **Updated:** 7 Feb 2025
- **Also known as:** GHSA-qwvc-x8q6-x63v

## What is CVE-2022-2939?

CVE-2022-2939 is a medium-severity vulnerability in gioni WP Cerber Security, Anti-spam & Malware Scan, published on 6 Sep 2022. 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 security protection bypass in versions up to, and including 9.0, that makes user enumeration possible. This is due to improper validation on the value supplied through the 'author' parameter found in the ~/cerber-load.php file. In vulnerable versions, the plugin only blocks requests if the value supplied is numeric, making it possible for attackers to supply additional non-numeric characters to bypass the protection. The non-numeric characters are stripped and the user requested is displayed. This can be used by unauthenticated attackers to gather information about users that can targeted in further attacks.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2022-2939?

It affects 1 product.


Products: Cerber Wp Cerber Security\, Anti-Spam \& Malware Scan.

## How do I fix CVE-2022-2939?

No fix has been published for CVE-2022-2939 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-2939 being exploited?

There is no known exploitation of CVE-2022-2939 in the wild and no public exploit code.

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

- [CVE-2022-4712](https://insights.sbomify.com/CVE-2022-4712/): WP Cerber Security <= 9.1 - Unauthenticated Stored Cross-Site Scripting (high 7.2)
- [CVE-2022-0429](https://insights.sbomify.com/CVE-2022-0429/): WP Cerber Security, Anti-spam & Malware Scan < 8.9.6 - Unauthenticated Stored Cross-Site Scripting (medium 6.1)
- [CVE-2022-4417](https://insights.sbomify.com/CVE-2022-4417/): WP Cerber < 9.3.3 - User Enumeration Bypass via Rest API (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-2939 and fix it if it is affected.

What it is: CVE-2022-2939 is a medium-severity vulnerability in gioni WP Cerber Security, Anti-spam & Malware Scan, published on 6 Sep 2022. 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-2022-2939 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-2022-2939/ (Markdown: https://insights.sbomify.com/CVE-2022-2939/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-2939
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-2939
- OSV: https://osv.dev/vulnerability/CVE-2022-2939

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-2939/
Summaries are generated and may contain mistakes; the official description above is the record.