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Fencer Vulns
high 7.5

CVE-2017-7762 json

When entered directly, Reader Mode did not strip the username and password section of URLs displayed in the addressbar.

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16737

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

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.

Patch / fix

  • Mozilla Firefox 54
  • firefox Ubuntu 14.04 LTS 54.0+build3-0ubuntu0.14.04.1
  • firefox Ubuntu 16.04 LTS 54.0+build3-0ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2017-7762

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • firefox RHEL 6 60.1.0-5.el6
  • firefox RHEL 7 60.1.0-4.el7_5

red hat advisories RHSA-2018:2112RHSA-2018:2113

  • firefox Arch Linux 54.0-1

arch linux advisories AVG-302

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-7762 updated cvss 7.5

Mozilla: address bar username and password spoofing in reader mode

  • Red Hat Enterprise Linux Client (v. 7) firefox 60.1.0-4.el7_5 Red Hat Enterprise Linux Client Optional (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux Desktop (v. 6) firefox 60.1.0-5.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 60.1.0-5.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 60.1.0-5.el6 Red Hat Enterprise Linux Server (v. 6) firefox 60.1.0-5.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux Server (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux Server Optional (v. 6) firefox 60.1.0-5.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux Server Optional (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux Workstation (v. 6) firefox 60.1.0-5.el6
    fixed: vendor fix RHSA-2018:2112
show 4 more
  • Red Hat Enterprise Linux Workstation (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 60.1.0-5.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux 6 thunderbird Red Hat Enterprise Linux 7 thunderbird Red Hat Enterprise Linux 8 firefox, thunderbird
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.88% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1358248 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

Affected products

  • Mozilla Firefox

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.