Description
When entered directly, Reader Mode did not strip the username and password section of URLs displayed in the addressbar. This can be used for spoofing the domain of the current page. This vulnerability affects Firefox < 54.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 54 | 54 |
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 | 54.0+build3-0ubuntu0.16.04.1 | USN-3315-1 |
| Ubuntu 14.04 LTS | firefox | 54.0+build3-0ubuntu0.14.04.1 | USN-3315-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | firefox | 60.1.0-4.el7_5 | RHSA-2018:2113 |
| RHEL 6 | firefox | 60.1.0-5.el6 | RHSA-2018:2112 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | firefox | 60.1.0-4.0.1.el7_5 | ELSA-2018-2113 |
Advisories 4
- RHSA-2018:2113 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2018:2112 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-3315-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- ELSA-2018-2113 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 4, 2018
References
- RHSA-2018:2112 vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2017-15/
- 1038689 vdb-entry
- RHSA-2018:2113 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1358248
- 99047 vdb-entry