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Fencer Vulns
high 7.5

CVE-2016-9900 json

External resources that should be blocked when loaded by SVG images can bypass security restrictions through the use of "data:" URLs.

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2016-10689

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
9.6%
EPSS 9.6% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

External resources that should be blocked when loaded by SVG images can bypass security restrictions through the use of "data:" URLs. This could allow for cross-domain data leakage. This vulnerability affects Firefox < 50.1, Firefox ESR < 45.6, and Thunderbird < 45.6.

Patch / fix

  • Mozilla Firefox 50.1
  • Mozilla Firefox ESR 45.6
  • Mozilla Thunderbird 45.6
  • firefox-esr Debian 14, Debian 13, Debian 12 45.6.0esr-1

debian advisories DEBIAN-CVE-2016-9900

  • firefox Ubuntu 14.04 LTS 50.1.0+build2-0ubuntu0.14.04.1
  • firefox Ubuntu 16.04 LTS 50.1.0+build2-0ubuntu0.16.04.1
  • thunderbird Ubuntu 14.04 LTS 1:45.7.0+build1-0ubuntu0.14.04.1
  • thunderbird Ubuntu 16.04 LTS 1:45.7.0+build1-0ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2016-9900

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

  • thunderbird RHEL 5 PRODUCTIVITY, RHEL 5 45.6.0-1.el5_11
  • thunderbird RHEL 6 45.6.0-1.el6_8
  • thunderbird RHEL 7 45.6.0-1.el7_3
  • firefox RHEL 5 45.6.0-1.el5_11
  • firefox RHEL 6 45.6.0-1.el6_8
  • firefox RHEL 7 45.6.0-1.el7_3

red hat advisories RHSA-2016:2973RHSA-2016:2946

  • MozillaFirefox SLES for SAP 12 SP2, SLES for SAP 12 SP1, SLES for SAP 12 +8 more 45.6.0esr-96.1
  • MozillaFirefox SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +6 more 45.6.0esr-62.1
  • MozillaFirefox SLES 11 SP2-LTSS 45.6.0esr-66.1

suse advisories SUSE-SU-2016:3223-1SUSE-SU-2016:3222-1SUSE-SU-2016:3210-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • MozillaThunderbird Package Hub 12 45.6.0-20.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10071-1openSUSE-SU-2024:10601-1openSUSE-SU-2016:3307-1openSUSE-SU-2016:3308-1

  • firefox-esr Alpine 3.4 45.6.0

alpine advisories ALPINE-CVE-2016-9900

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • firefox Arch Linux 50.1.0-1

arch linux advisories AVG-106

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-2016-9900 updated cvss 7.5

Mozilla: Restricted external resources can be loaded by SVG images through data URLs (MFSA 2016-94, MFSA 2016-95)

  • Red Hat Enterprise Linux (v. 5 server) firefox 45.6.0-1.el5_11 Red Hat Enterprise Linux Client (v. 7) firefox 45.6.0-1.el7_3, thunderbird 45.6.0-1.el7_3 Red Hat Enterprise Linux Client Optional (v. 7) firefox 45.6.0-1.el7_3 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 45.6.0-1.el5_11, thunderbird 45.6.0-1.el5_11 Red Hat Enterprise Linux Desktop (v. 6) firefox 45.6.0-1.el6_8, thunderbird 45.6.0-1.el6_8 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 45.6.0-1.el6_8
    +1 more products
    Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 45.6.0-1.el6_8
    fixed: vendor fix RHSA-2016:2946
  • Red Hat Enterprise Linux Optional Productivity Applications (v. 5 server) thunderbird 45.6.0-1.el5_11
    fixed: vendor fix RHSA-2016:2973
  • Red Hat Enterprise Linux Server (v. 6) firefox 45.6.0-1.el6_8 Red Hat Enterprise Linux Server (v. 7) firefox 45.6.0-1.el7_3 Red Hat Enterprise Linux Server Optional (v. 6) firefox 45.6.0-1.el6_8, thunderbird 45.6.0-1.el6_8 Red Hat Enterprise Linux Server Optional (v. 7) firefox 45.6.0-1.el7_3, thunderbird 45.6.0-1.el7_3 Red Hat Enterprise Linux Workstation (v. 6) firefox 45.6.0-1.el6_8, thunderbird 45.6.0-1.el6_8 Red Hat Enterprise Linux Workstation (v. 7) firefox 45.6.0-1.el7_3, thunderbird 45.6.0-1.el7_3
    +2 more products
    Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 45.6.0-1.el6_8 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 45.6.0-1.el7_3
    fixed: vendor fix RHSA-2016:2946

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

9.61% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1319122 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:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • Mozilla Firefox
  • Mozilla Firefox ESR
  • Mozilla Thunderbird

Classification

Weakness

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.