# CVE-2021-24731: Pie Register < 3.7.1.6 - Unauthenticated SQL Injection

> Unauthenticated attackers can execute arbitrary SQL commands via the login REST API endpoint in the Pie Register WordPress plugin.

- **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:** 8 Nov 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-3m93-8pm8-gqxj

## What is CVE-2021-24731?

CVE-2021-24731 is a critical SQL injection vulnerability in Unknown Registration Forms – User profile, Content Restriction, Spam Protection, Payment Gateways, Invitation Codes, published on 8 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Registration Forms – User profile, Content Restriction, Spam Protection, Payment Gateways, Invitation Codes WordPress plugin before 3.7.1.6 does not properly escape user data before using it in a SQL statement in the wp-json/pie/v1/login REST API endpoint, leading to an SQL injection.

Weakness: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command)

## Which versions are affected by CVE-2021-24731?

It affects 1 product.


Products: Genetechsolutions Pie Register.

## How do I fix CVE-2021-24731?

No fix has been published for CVE-2021-24731 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24731 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-24731 exists.

Public exploit code:

- Pie Register < 3.7.1.6 - SQL Injection (nuclei): http/cves/2021/CVE-2021-24731.yaml

## Other vulnerabilities in Unknown Registration Forms – User profile, Content Restriction, Spam Protection, Payment Gateways, Invitation Codes

- [CVE-2024-27957](https://insights.sbomify.com/CVE-2024-27957/): WordPress Pie Register plugin <= 3.8.3.1 - Unauthenticated Arbitrary File Upload vulnerability (critical 10.0)
- [CVE-2019-15659](https://insights.sbomify.com/CVE-2019-15659/): SQL injection in n/a (critical 9.8)
- [CVE-2018-10969](https://insights.sbomify.com/CVE-2018-10969/): SQL injection in n/a (critical 9.8)
- [CVE-2021-24647](https://insights.sbomify.com/CVE-2021-24647/): Pie Register < 3.7.1.6 - Unauthenticated Arbitrary Login (high 8.1)
- [CVE-2022-4024](https://insights.sbomify.com/CVE-2022-4024/): Pie Register < 3.8.1.3 - Unauthenticated Arbitrary User Deletion (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24731 and fix it if it is affected.

What it is: CVE-2021-24731 is a critical SQL injection vulnerability in Unknown Registration Forms – User profile, Content Restriction, Spam Protection, Payment Gateways, Invitation Codes, published on 8 Nov 2021. 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-2021-24731 exists.

Affected product: Unknown Registration Forms – User profile, Content Restriction, Spam Protection, Payment Gateways, Invitation Codes. 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-2021-24731/ (Markdown: https://insights.sbomify.com/CVE-2021-24731/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24731
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24731
- OSV: https://osv.dev/vulnerability/CVE-2021-24731

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-24731/
Summaries are generated and may contain mistakes; the official description above is the record.