# CVE-2023-4719: Simple Membership <= 4.3.5 - Reflected Cross-Site Scripting

> Unauthenticated attackers can inject arbitrary scripts via the list_type parameter, requiring user interaction to execute malicious code.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/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:** 6 Sep 2023
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-fwcj-v244-qf8f

## What is CVE-2023-4719?

CVE-2023-4719 is a high-severity cross-site scripting vulnerability in wpinsider-1 Simple Membership, published on 6 Sep 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Simple Membership plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the `list_type` parameter in versions up to, and including, 4.3.5 due to insufficient input sanitization and output escaping. Using this vulnerability, unauthenticated attackers could inject arbitrary web scripts into pages that are being executed if they can successfully trick a user into taking an action, such as clicking a malicious link.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2023-4719?

It affects 1 product.


Products: Simple-Membership-Plugin Simple Membership.

## How do I fix CVE-2023-4719?

No fix has been published for CVE-2023-4719 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-4719 being exploited?

There is no known exploitation of CVE-2023-4719 in the wild and no public exploit code.

## Other vulnerabilities in wpinsider-1 Simple Membership

- [CVE-2022-2317](https://insights.sbomify.com/CVE-2022-2317/): Simple Membership < 4.1.3 - Unauthenticated Membership Privilege Escalation (critical 9.8)
- [CVE-2023-41956](https://insights.sbomify.com/CVE-2023-41956/): WordPress Simple Membership plugin <= 4.3.4 - Authenticated Account Takeover vulnerability (high 8.8)
- [CVE-2022-2273](https://insights.sbomify.com/CVE-2022-2273/): Simple Membership < 4.1.3 - Membership Privilege Escalation (high 8.8)
- [CVE-2016-10884](https://insights.sbomify.com/CVE-2016-10884/): Cross-site request forgery in n/a (high 8.8)
- [CVE-2019-14328](https://insights.sbomify.com/CVE-2019-14328/): Cross-site request forgery in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-4719 and fix it if it is affected.

What it is: CVE-2023-4719 is a high-severity cross-site scripting vulnerability in wpinsider-1 Simple Membership, published on 6 Sep 2023. 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-2023-4719 in the wild and no public exploit code.

Affected product: wpinsider-1 Simple Membership. 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-2023-4719/ (Markdown: https://insights.sbomify.com/CVE-2023-4719/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-4719
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-4719
- OSV: https://osv.dev/vulnerability/CVE-2023-4719

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-4719/
Summaries are generated and may contain mistakes; the official description above is the record.