# CVE-2020-35698: Cross-site scripting in n/a

> An attacker can execute arbitrary JavaScript in victim browsers via a crafted URL, potentially leading to session hijacking or account takeover on Thinkific hosted sites.

- **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:** 25 Jul 2023
- **Updated:** 23 Oct 2024
- **Also known as:** GHSA-c2w3-xrch-w38j

## What is CVE-2020-35698?

CVE-2020-35698 is a medium-severity cross-site scripting vulnerability in n/a, published on 25 Jul 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

Thinkific Thinkific Online Course Creation Platform 1.0 is affected by: Cross Site Scripting (XSS). The impact is: execute arbitrary code (remote). The component is: Affected Source code of the website CMS which is been used by many to host their online courses using the Thinkific Platform. The attack vector is: To exploit the vulnerability any user has to just visit the link - https://hacktify.thinkific.com/account/billing?success=%E2%80%AA%3Cscript%3Ealert(1)%3C/script%3E. ¶¶ Thinkific is a Website based Learning Platform Product which is used by thousands of users worldwide. There is a Cross Site Scripting (XSS) based vulnerability in the code of the CMS where any attacker can execute a XSS attack. Proof of Concept & Steps to Reproduce: Step1 : Go to Google.com Step 2 : Search for this Dork site:thinkific.com -www Step 3 : You will get a list of websites which are running on the thinkific domains. Step 4 : Create account and signin in any of the website Step 5 : Add this endpoint at the end of the domain and you will see that there is a XSS Alert /account/billing?success=%E2%80%AA<script>alert(1)</script> Step 6 : Choose any domains from google for any website this exploit will work on all the websites as it is a code based flaw in the CMS Step 7 : Thousands of websites are vulnerable due to this vulnerable code in the CMS itself which is giving rise to the XSS attack.

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

## Which versions are affected by CVE-2020-35698?

It affects 1 product.


Products: Thinkific Thinkific.

## How do I fix CVE-2020-35698?

No fix has been published for CVE-2020-35698 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-35698 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-35698 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-35698 and fix it if it is affected.

What it is: CVE-2020-35698 is a medium-severity cross-site scripting vulnerability in n/a, published on 25 Jul 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-2020-35698 exists.

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-2020-35698/ (Markdown: https://insights.sbomify.com/CVE-2020-35698/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-35698
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-35698
- OSV: https://osv.dev/vulnerability/CVE-2020-35698

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-35698/
Summaries are generated and may contain mistakes; the official description above is the record.