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Fencer Vulns
critical 9.8

CVE-2016-9901 json

HTML tags received from the Pocket server will be processed without sanitization and any JavaScript code executed will be run in the "about…

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2016-10690

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.8%
EPSS 2.8% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

HTML tags received from the Pocket server will be processed without sanitization and any JavaScript code executed will be run in the "about:pocket-saved" (unprivileged) page, giving it access to Pocket's messaging API through HTML injection. This vulnerability affects Firefox ESR < 45.6 and Firefox < 50.1.

Patch / fix

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

debian advisories DEBIAN-CVE-2016-9901

  • 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

ubuntu advisories UBUNTU-CVE-2016-9901

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

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10071-1

  • firefox-esr Alpine 3.4 45.6.0

alpine advisories ALPINE-CVE-2016-9901

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-2016-9901 updated cvss 9.8

Mozilla: Data from Pocket server improperly sanitized before execution (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

2.82% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • Mozilla Firefox ESR
  • 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.