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CVE-2016-9076

17
FAUCET Score

CVE-2016-9076 describes a medium-severity vulnerability in Mozilla Firefox versions prior to 50, where a specially crafted HTML <select> dropdown menu could obscure the browser's location bar. This spoofing attack, requiring e10s (Electrolysis) to be enabled, could trick users into believing they are on a legitimate site. The vulnerability has a CVSSv3 score of 5.9, indicating a network-based attack with high integrity impact but no confidentiality or availability impact, and a high attack complexity. There is no evidence of active exploitation, nor is public exploit code available, and it has received minimal community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 50.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
< 50CPE match
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.80%
Probability of exploitation in next 30 days
EPSS Percentile
76.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0180 is in the 56th percentile among its peer group of 19,956 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Media Mentions

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

Remediation

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2016-9076Moderate

firefox: select dropdown menu can be used for URL bar spoofing on e10s

Nov 15, 2016

References

bugzilla.mozilla.org / show_bug.cgi
Issue TrackingVendor Advisory
mozilla.org / security/advisories/mfsa2016-89
Vendor Advisory
securityfocus.com / bid/94337
Third Party AdvisoryVDB Entry
securitytracker.com / id/1037298
Third Party AdvisoryVDB Entry