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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | firefox | 46.0+build5-0ubuntu0.16.04.2 | USN-2936-1 |
| Ubuntu 14.04 LTS | firefox | 46.0+build5-0ubuntu0.14.04.2 | USN-2936-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 50.1.0-1.1 | openSUSE-SU-2024:10071-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
Advisories 3
- USN-2936-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10071-1 MozillaFirefox-50.1.0-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- openSUSE-SU-2016:1211 vendor-advisory
- 1035692 vdb-entry
- openSUSE-SU-2016:1251 vendor-advisory
- USN-2936-2 vendor-advisory
- GLSA-201701-15 vendor-advisory
- USN-2936-1 vendor-advisory
- USN-2936-3 vendor-advisory
- http://www.mozilla.org/security/announce/2016/mfsa2016-48.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=870870