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Fencer Vulns
high 8.8

CVE-2017-7798 json

The Developer Tools feature suffers from a XUL injection vulnerability due to improper sanitization of the web page source code.

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16773

cvss
8.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits
0
none known

Summary

The Developer Tools feature suffers from a XUL injection vulnerability due to improper sanitization of the web page source code. In the worst case, this could allow arbitrary code execution when opening a malicious page with the style editor tool. This vulnerability affects Firefox ESR < 52.3 and Firefox < 55.

Patch / fix

  • Mozilla Firefox ESR 52.3
  • Mozilla Firefox 55
  • firefox-esr Debian 14, Debian 13, Debian 12 52.3.0esr-1

debian advisories DEBIAN-CVE-2017-7798

  • firefox Ubuntu 14.04 LTS 55.0.1+build2-0ubuntu0.14.04.2
  • firefox Ubuntu 16.04 LTS 55.0.1+build2-0ubuntu0.16.04.2

ubuntu advisories UBUNTU-CVE-2017-7798

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 52.3.0-3.el6_9
  • firefox RHEL 7 52.3.0-2.el7_4

red hat advisories RHSA-2017:2456

  • MozillaFirefox SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for SAP 12 SP1 +10 more 52.3.0esr-109.3.1
  • MozillaFirefox SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 52.3.0esr-72.9.1
  • MozillaFirefox-branding-SLED SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +2 more 52-24.5.1

suse advisories SUSE-SU-2017:2589-1SUSE-SU-2017:2302-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 92.0-1.2
  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • MozillaThunderbird Package Hub 12 52.3.0-42.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2024:10601-1openSUSE-SU-2017:2209-1

  • firefox Arch Linux 55.0-1

arch linux advisories AVG-375

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-2017-7798 updated cvss 8.8

Mozilla: XUL injection in the style editor in devtools (MFSA 2017-19)

  • Red Hat Enterprise Linux Client (v. 7) firefox 52.3.0-2.el7_4 Red Hat Enterprise Linux Client Optional (v. 7) firefox 52.3.0-2.el7_4 Red Hat Enterprise Linux Desktop (v. 6) firefox 52.3.0-3.el6_9 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 52.3.0-3.el6_9 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 52.3.0-3.el6_9 Red Hat Enterprise Linux Server (v. 6) firefox 52.3.0-3.el6_9
    +7 more products
    Red Hat Enterprise Linux Server (v. 7) firefox 52.3.0-2.el7_4 Red Hat Enterprise Linux Server Optional (v. 6) firefox 52.3.0-3.el6_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 52.3.0-2.el7_4 Red Hat Enterprise Linux Workstation (v. 6) firefox 52.3.0-3.el6_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 52.3.0-2.el7_4 Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 52.3.0-3.el6_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 52.3.0-2.el7_4
    fixed: vendor fix RHSA-2017:2456

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

2.05% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Mozilla Firefox ESR
  • Mozilla Firefox

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code

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.