# CVE-2023-0733: Newsletter Popup <= 1.2 - Unauthenticated Stored XSS

> Unauthenticated attackers can inject malicious scripts via unsanitized settings in the Newsletter Popup WordPress plugin, leading to stored XSS.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:** A user has to click or open something
- **Fix available:** No
- **Published:** 30 May 2023
- **Updated:** 10 Jan 2025
- **Also known as:** GHSA-xc2c-p2fc-pq4v

## What is CVE-2023-0733?

CVE-2023-0733 is a medium-severity cross-site scripting vulnerability in Unknown Newsletter Popup, published on 30 May 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

The Newsletter Popup WordPress plugin through 1.2 does not sanitise and escape some of its settings, which could allow unauthenticated users to perform Stored Cross-Site Scripting attacks

## Which versions are affected by CVE-2023-0733?

It affects 1 product.


Products: Newsletter Popup Project Newsletter Popup.

## How do I fix CVE-2023-0733?

No fix has been published for CVE-2023-0733 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-0733 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-0733 exists.

## Other vulnerabilities in Unknown Newsletter Popup

- [CVE-2023-0766](https://insights.sbomify.com/CVE-2023-0766/): Newsletter Popup <= 1.2 - Record Deletion via CSRF (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-0733 and fix it if it is affected.

What it is: CVE-2023-0733 is a medium-severity cross-site scripting vulnerability in Unknown Newsletter Popup, published on 30 May 2023. An attacker can exploit it over the internet without logging in, 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-2023-0733 exists.

Affected product: Unknown Newsletter Popup. 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-2023-0733/ (Markdown: https://insights.sbomify.com/CVE-2023-0733/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-0733
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-0733
- OSV: https://osv.dev/vulnerability/CVE-2023-0733

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-0733/
Summaries are generated and may contain mistakes; the official description above is the record.