# CVE-2023-6000: Popup Builder < 4.2.3 - Unauthenticated Stored XSS

> Unauthenticated attackers can inject JavaScript into popups, leading to stored XSS attacks in the Popup Builder WordPress plugin.

- **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:** 1 Jan 2024
- **Updated:** 18 Jun 2025
- **Also known as:** GHSA-fhw3-qv5f-7vrw

## What is CVE-2023-6000?

CVE-2023-6000 is a medium-severity cross-site scripting vulnerability in Unknown Popup Builder, published on 1 Jan 2024. 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 Popup Builder WordPress plugin before 4.2.3 does not prevent simple visitors from updating existing popups, and injecting raw JavaScript in them, which could lead to Stored XSS attacks.

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

## Which versions are affected by CVE-2023-6000?

It affects 1 product.


Products: Sygnoos Popup Builder.

## How do I fix CVE-2023-6000?

No fix has been published for CVE-2023-6000 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-6000 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-6000 exists.

Public exploit code:

- This vulnerability displays an XSS flaw in a WordPress popup plugin, allowing attackers to inject malicious JavaScript through a stored XSS (github_poc): https://github.com/RonF98/CVE-2023-6000-POC
- WordPress Popup Builder <= 4.2.3 - Unauthenticated Stored XSS (nuclei): http/cves/2023/CVE-2023-6000.yaml

## Other vulnerabilities in Unknown Popup Builder

- [CVE-2022-0479](https://insights.sbomify.com/CVE-2022-0479/): Popup Builder < 4.1.1 - SQL Injection to Reflected Cross-Site Scripting (critical 9.8)
- [CVE-2020-9006](https://insights.sbomify.com/CVE-2020-9006/): SQL injection in n/a (critical 9.8)
- [CVE-2019-14695](https://insights.sbomify.com/CVE-2019-14695/): SQL injection in n/a (critical 9.8)
- [CVE-2021-25082](https://insights.sbomify.com/CVE-2021-25082/): Popup Builder < 4.0.7 - LFI to RCE (high 8.8)
- [CVE-2023-6696](https://insights.sbomify.com/CVE-2023-6696/): Missing authorization in Popup Builder – Create highly converting, mobile friendly marketing popups. (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-6000 and fix it if it is affected.

What it is: CVE-2023-6000 is a medium-severity cross-site scripting vulnerability in Unknown Popup Builder, published on 1 Jan 2024. 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-2023-6000 exists.

Affected product: Unknown Popup Builder. 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-2023-6000/ (Markdown: https://insights.sbomify.com/CVE-2023-6000/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-6000
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-6000
- OSV: https://osv.dev/vulnerability/CVE-2023-6000

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-6000/
Summaries are generated and may contain mistakes; the official description above is the record.