The extensions API in Google Chrome prior to 55.0.2883.75 for Mac, Windows and Linux, and 55.0.2883.84 for Android incorrectly permitted ac…

published 2017-01-19 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-6168

cvss: 6.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 69%
public exploits: 0; none known

The extensions API in Google Chrome prior to 55.0.2883.75 for Mac, Windows and Linux, and 55.0.2883.84 for Android incorrectly permitted access to privileged plugins, which allowed a remote attacker to bypass site isolation via a crafted HTML page.

Patch / fix

distros 4

ubuntu red hat opensuse arch linux

chromium-browser Ubuntu 14.04 LTS 58.0.3029.81-0ubuntu0.14.04.1172
chromium-browser Ubuntu 16.04 LTS 55.0.2883.87-0ubuntu0.16.04.1263

ubuntu advisories UBUNTU-CVE-2016-5217

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

chromium-browser RHEL 6 EXTRAS 55.0.2883.75-1.el6

red hat advisories RHSA-2016:2919

chromium openSUSE Tumbleweed 55.0.2883.75-3.1
chromium openSUSE Tumbleweed 113.0.5672.92-1.1
chromium Package Hub 12 SP2 55.0.2883.75-2.1

opensuse advisories openSUSE-SU-2024:10171-1 openSUSE-SU-2024:12948-1 openSUSE-SU-2017:0563-1

chromium Arch Linux 55.0.2883.75-1

arch linux advisories AVG-93

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-2016-5217 updated 2026-06-28 cvss 6.5

chromium-browser: use of unvalidated data in pdfium

Red Hat Enterprise Linux Desktop Supplementary (v. 6) chromium-browser 55.0.2883.75-1.el6 Red Hat Enterprise Linux Server Supplementary (v. 6) chromium-browser 55.0.2883.75-1.el6 Red Hat Enterprise Linux Workstation Supplementary (v. 6) chromium-browser 55.0.2883.75-1.el6
fixed: vendor fix RHSA-2016:2919

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

1.23% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	6.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

n/a Google Chrome prior to 55.0.2883.75 for Mac, Windows and Linux, and 55.0.2883.84 for Android

Classification

Weakness

CWE-284 Improper Access Control

Technology feeds

Google Chrome rss critical rss

References

rhn.redhat.com /errata/RHSA-2016-2919.html
vendor-advisory
security.gentoo.org /glsa/201612-11
vendor-advisory
securityfocus.com /bid/94633
vdb-entry
crbug.com /654280
chromereleases.googleblog.com /2016/12/stable-channel-update-for-desktop.html

Sources

CVE List CVE-2016-5217
NVD CVE-2016-5217

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.

Summary