CVE-2017-7762

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2018-06-11 · updated 2026-06-17
Weakness: CWE-20

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

Mozilla Firefox: before 54.0 — fixed in 54.0
RedHat Enterprise Linux Desktop: 6.0, 7.0
RedHat Enterprise Linux Server: 6.0, 7.0
RedHat Enterprise Linux Workstation: 6.0, 7.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 54.0. Check the vendor advisory for mitigations.

References

http://www.securityfocus.com/bid/99047
http://www.securitytracker.com/id/1038689
https://access.redhat.com/errata/RHSA-2018:2112
https://access.redhat.com/errata/RHSA-2018:2113
https://bugzilla.mozilla.org/show_bug.cgi?id=1358248
https://www.mozilla.org/security/advisories/mfsa2017-15/
http://www.securityfocus.com/bid/99047
http://www.securitytracker.com/id/1038689
https://access.redhat.com/errata/RHSA-2018:2112
https://access.redhat.com/errata/RHSA-2018:2113
https://bugzilla.mozilla.org/show_bug.cgi?id=1358248
https://www.mozilla.org/security/advisories/mfsa2017-15/

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