# CVE-2020-35933: Cross-site scripting in n/a

> Authenticated attackers can inject JavaScript via AJAX requests in the WordPress Newsletter plugin, potentially leading to session hijacking or malicious actions.

- **Severity:** Medium 6.5 (`CVSS:3.1/AC:L/AV:N/A:L/C:L/I:L/PR:L/S:C/UI:R`)
- **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:** 1 Jan 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-25x7-rqcx-mfwh

## What is CVE-2020-35933?

CVE-2020-35933 is a medium-severity cross-site scripting vulnerability in n/a, published on 1 Jan 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

A Reflected Authenticated Cross-Site Scripting (XSS) vulnerability in the Newsletter plugin before 6.8.2 for WordPress allows remote attackers to trick a victim into submitting a tnpc_render AJAX request containing either JavaScript in an options parameter, or a base64-encoded JSON string containing JavaScript in the encoded_options parameter.

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

## Which versions are affected by CVE-2020-35933?

It affects 1 product.


Products: Thenewsletterplugin Newsletter.

## How do I fix CVE-2020-35933?

No fix has been published for CVE-2020-35933 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-35933 being exploited?

There is no known exploitation of CVE-2020-35933 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2024-5317](https://insights.sbomify.com/CVE-2024-5317/): Newsletter <= 8.3.4 - Unauthenticated Stored Cross-Site Scripting via np1 (medium 6.4)
- [CVE-2023-4772](https://insights.sbomify.com/CVE-2023-4772/): Newsletter <= 7.8.9 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode (medium 6.4)
- [CVE-2023-27922](https://insights.sbomify.com/CVE-2023-27922/): Cross-site scripting in Newsletter (medium 6.1)
- [CVE-2022-1756](https://insights.sbomify.com/CVE-2022-1756/): Newsletter < 7.4.5 - Reflected Cross-Site Scripting (medium 6.1)
- [CVE-2025-3581](https://insights.sbomify.com/CVE-2025-3581/): Newsletter < 8.8.5 - Admin+ Stored XSS via Widget (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-35933 and fix it if it is affected.

What it is: CVE-2020-35933 is a medium-severity cross-site scripting vulnerability in n/a, published on 1 Jan 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-35933 in the wild and no public exploit code.

Affected product: n/a. 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-2020-35933/ (Markdown: https://insights.sbomify.com/CVE-2020-35933/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-35933
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-35933
- OSV: https://osv.dev/vulnerability/CVE-2020-35933

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-35933/
Summaries are generated and may contain mistakes; the official description above is the record.