CVE-2016-9903 — Mozilla's add-ons SDK had a world-accessible resource with an HTML injection vulnerability

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MEDIUM

Mozilla's add-ons SDK had a world-accessible resource with an HTML injection vulnerability

Published Jun 11, 2018

6.1

MEDIUM

CVSS 3.0

EPSS 1.14%

Description

Mozilla's add-ons SDK had a world-accessible resource with an HTML injection vulnerability. If an additional vulnerability allowed this resource to be loaded as a document it could allow injecting content and script into an add-on's context. This vulnerability affects Firefox < 50.1.

Affected products

Vendor Mozilla Product Firefox Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <50.1

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Mozilla

Firefox

n/a

Version	Status	Constraints
unspecified	affected	<50.1

Remediation

No remediation recorded yet.

Metrics

1.14% 0.01143

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.01143

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (10 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	1.14% (0.01143)	65.50th	v5 (v2026.06.15)
Jun 15, 2026	1.14% (0.01143)	62.41th	v5 (v2026.06.15)
Mar 17, 2025	0.79% (0.00790)	72.21th	v4 (v2025.03.14)
Dec 12, 2024	0.14% (0.00138)	50.97th	v3 (v2023.03.01)
Nov 2, 2023	0.14% (0.00138)	49.16th	v3 (v2023.03.01)
Mar 7, 2023	0.20% (0.00204)	56.53th	v3 (v2023.03.01)
Mar 6, 2023	1.02% (0.01018)	40.69th	v2 (v2022.01.01)
Sep 10, 2022	1.02% (0.01018)	38.88th	v2 (v2022.01.01)
Apr 1, 2022	1.02% (0.01018)	36.86th	v2 (v2022.01.01)
Feb 4, 2022	1.02% (0.01018)	19.50th	v2 (v2022.01.01)

Weaknesses (1)

CWE-79

Cross-site Scripting (XSS)

References (4)

http://www.securityfocus.com/bid/94883
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1037461
vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1315435
x_refsource_CONFIRMIssue TrackingPatchVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2016-94/
x_refsource_CONFIRMVendor Advisory

Link	Providers	Tags
http://www.securityfocus.com/bid/94883		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1037461		vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1315435		x_refsource_CONFIRMIssue TrackingPatchVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2016-94/		x_refsource_CONFIRMVendor Advisory