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CVE-2016-9903

19
FAUCET Score

CVE-2016-9903 describes an HTML injection vulnerability within Mozilla's add-ons SDK, affecting Firefox versions prior to 50.1. This flaw could allow an attacker to inject content and script into an add-on's context if another vulnerability enabled the world-accessible resource to be loaded as a document. Rated as Medium severity (CVSS 6.1), it requires user interaction and a low attack complexity, potentially leading to limited impact on confidentiality and integrity. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 50.1CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.14%
Probability of exploitation in next 30 days
EPSS Percentile
63.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0114 is in the 76th percentile among its peer group of 26,219 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (1)

mozillapatch availablevia nvd_reference
View patch

References

bugzilla.mozilla.org / show_bug.cgi
Issue TrackingPatchVendor Advisory
mozilla.org / security/advisories/mfsa2016-94
Vendor Advisory
securityfocus.com / bid/94883
Third Party AdvisoryVDB Entry
securitytracker.com / id/1037461
Third Party AdvisoryVDB Entry