# CVE-2023-4213: Missing authorization in Simplr Registration Form Plus+

> Authenticated subscribers can change arbitrary user passwords, potentially taking over administrator accounts in the Simplr Registration Form Plus+ WordPress plugin.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Sep 2023
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-9f9f-hrxg-722w

## What is CVE-2023-4213?

CVE-2023-4213 is a high-severity missing authorization vulnerability in mpvanwinkle77 Simplr Registration Form Plus+, published on 13 Sep 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The Simplr Registration Form Plus+ plugin for WordPress is vulnerable to Insecure Direct Object References in versions up to, and including, 2.4.5. This is due to the plugin providing user-controlled access to objects, letting a user bypass authorization and access system resources. This makes it possible for authenticated attackers with subscriber-level permissions or above to change user passwords and potentially take over administrator accounts.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2023-4213?

It affects 1 product.


Products: Mikevanwinkle Simplr Registration Form Plus\+.

## How do I fix CVE-2023-4213?

No fix has been published for CVE-2023-4213 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-4213 being exploited?

There is no known exploitation of CVE-2023-4213 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-4213 and fix it if it is affected.

What it is: CVE-2023-4213 is a high-severity missing authorization vulnerability in mpvanwinkle77 Simplr Registration Form Plus+, published on 13 Sep 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-4213 in the wild and no public exploit code.

Affected product: mpvanwinkle77 Simplr Registration Form Plus+. 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-2023-4213/ (Markdown: https://insights.sbomify.com/CVE-2023-4213/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-4213
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-4213
- OSV: https://osv.dev/vulnerability/CVE-2023-4213

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-4213/
Summaries are generated and may contain mistakes; the official description above is the record.