# CVE-2023-0374: W4 Post List < 2.4.6 - Contributor+ Stored XSS

> Contributors can inject malicious scripts via block options in the W4 Post List plugin, leading to stored XSS attacks on embedded pages.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 17 Apr 2023
- **Updated:** 6 Feb 2025
- **Also known as:** GHSA-r6hq-mwrm-ppjg

## What is CVE-2023-0374?

CVE-2023-0374 is a medium-severity cross-site scripting vulnerability in Unknown W4 Post List, published on 17 Apr 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

The W4 Post List WordPress plugin before 2.4.6 does not validate and escape some of its block options before outputting them back in a page/post where the block is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks.

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

## Which versions are affected by CVE-2023-0374?

It affects 1 product.


Products: W4 Post List Project W4 Post List.

## How do I fix CVE-2023-0374?

No fix has been published for CVE-2023-0374 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-0374 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-0374 exists.

## Other vulnerabilities in Unknown W4 Post List

- [CVE-2023-27413](https://insights.sbomify.com/CVE-2023-27413/): WordPress W4 Post List Plugin <= 2.4.4 is vulnerable to Cross Site Scripting (XSS) (medium 6.5)
- [CVE-2023-1371](https://insights.sbomify.com/CVE-2023-1371/): W4 Post List < 2.4.6 - Subscriber+ Password Protected Post Content Disclosure (medium 6.5)
- [CVE-2023-1373](https://insights.sbomify.com/CVE-2023-1373/): W4 Post List < 2.4.6 - Reflected XSS (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-0374 and fix it if it is affected.

What it is: CVE-2023-0374 is a medium-severity cross-site scripting vulnerability in Unknown W4 Post List, published on 17 Apr 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-0374 exists.

Affected product: Unknown W4 Post List. 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-2023-0374/ (Markdown: https://insights.sbomify.com/CVE-2023-0374/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-0374
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-0374
- OSV: https://osv.dev/vulnerability/CVE-2023-0374

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-0374/
Summaries are generated and may contain mistakes; the official description above is the record.