# CVE-2023-1767: Cross-site scripting in Snyk Advisor

> Attackers can inject malicious scripts via NPM package READMEs, executing code in users' browsers on Snyk Advisor pages.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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:** 20 Apr 2023
- **Updated:** 5 Feb 2025
- **Also known as:** GHSA-66mg-wfxj-x3xv

## What is CVE-2023-1767?

CVE-2023-1767 is a medium-severity cross-site scripting vulnerability in Snyk Advisor, published on 20 Apr 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 Snyk Advisor website (https://snyk.io/advisor/) was vulnerable to a stored XSS prior to 28th March 2023. A feature of Snyk Advisor is to display the contents of a scanned package's Readme on its package health page. An attacker could create a package in NPM with an associated markdown README file containing XSS-able HTML tags. Upon Snyk Advisor importing the package, the XSS would run each time an end user browsed to the package's page on Snyk Advisor.

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

## Which versions are affected by CVE-2023-1767?

It affects 1 product.


Products: Snyk Advisor.

## How do I fix CVE-2023-1767?

No fix has been published for CVE-2023-1767 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-1767 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-1767 exists.

Public exploit code:

- https://github.com/weizman/CVE-2023-1767 (github_poc): https://github.com/weizman/CVE-2023-1767

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-1767 and fix it if it is affected.

What it is: CVE-2023-1767 is a medium-severity cross-site scripting vulnerability in Snyk Advisor, published on 20 Apr 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-2023-1767 exists.

Affected product: Snyk Advisor. 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-2023-1767/ (Markdown: https://insights.sbomify.com/CVE-2023-1767/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-1767
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-1767
- OSV: https://osv.dev/vulnerability/CVE-2023-1767

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-1767/
Summaries are generated and may contain mistakes; the official description above is the record.