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CVE-2016-1949

25
FAUCET Score

CVE-2016-1949 describes a vulnerability in Mozilla Firefox versions prior to 44.0.2 where improper interaction between Service Workers and plugins allows remote attackers to bypass the Same Origin Policy. This high-severity vulnerability (CVSS 8.8) involves a network-based attack requiring user interaction, leading to potential high impact on confidentiality, integrity, and availability. While no public exploit code or active exploitation is confirmed, the vulnerability has garnered some community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 44.0.1CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.8HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.50%
Probability of exploitation in next 30 days
EPSS Percentile
71.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0150 is in the 70th percentile among its peer group of 14,848 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2016-1949Critical

firefox: Same-origin-policy violation using Service Workers with plugins

Feb 11, 2016

References

lists.opensuse.org / opensuse-updates/2016-02/msg00102.html
lists.opensuse.org / opensuse-updates/2016-02/msg00142.html
bugzilla.mozilla.org / show_bug.cgi
security.gentoo.org / glsa/201605-06
mozilla.org / security/announce/2016/mfsa2016-13.html
Vendor Advisory
securitytracker.com / id/1035007
ubuntu.com / usn/USN-2893-1