Description
Unsanitized output in the browser UI leaves HTML tags in place and can result in arbitrary code execution in Firefox before version 58.0.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Firefox | All versions prior to Firefox 58.0.1 | — |
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 18.04 LTS | firefox | 59.0.1+build1-0ubuntu1 | — |
| Ubuntu 16.04 LTS | firefox | 58.0.1+build1-0ubuntu0.16.04.1 | USN-3552-1 |
| Ubuntu 14.04 LTS | firefox | 58.0.1+build1-0ubuntu0.14.04.1 | USN-3552-1 |
Advisories 1
- USN-3552-1 firefox vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026