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Vulnerability details: VCID-kvxt-7wyx-dfbr
Vulnerability ID VCID-kvxt-7wyx-dfbr
Aliases CVE-2017-7816
Summary WebExtensions could use popups and panels in the extension UI to load an about: privileged URL, violating security checks that disallow this behavior.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-20 Improper Input Validation
System Score Found at
epss 0.00272 https://api.first.org/data/v1/epss?cve=CVE-2017-7816
epss 0.00272 https://api.first.org/data/v1/epss?cve=CVE-2017-7816
epss 0.00272 https://api.first.org/data/v1/epss?cve=CVE-2017-7816
epss 0.00272 https://api.first.org/data/v1/epss?cve=CVE-2017-7816
epss 0.00272 https://api.first.org/data/v1/epss?cve=CVE-2017-7816
epss 0.00272 https://api.first.org/data/v1/epss?cve=CVE-2017-7816
epss 0.00272 https://api.first.org/data/v1/epss?cve=CVE-2017-7816
epss 0.00272 https://api.first.org/data/v1/epss?cve=CVE-2017-7816
epss 0.00272 https://api.first.org/data/v1/epss?cve=CVE-2017-7816
epss 0.00272 https://api.first.org/data/v1/epss?cve=CVE-2017-7816
epss 0.00272 https://api.first.org/data/v1/epss?cve=CVE-2017-7816
epss 0.00272 https://api.first.org/data/v1/epss?cve=CVE-2017-7816
epss 0.00272 https://api.first.org/data/v1/epss?cve=CVE-2017-7816
epss 0.00272 https://api.first.org/data/v1/epss?cve=CVE-2017-7816
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2017-7816
cvssv3 5.3 https://nvd.nist.gov/vuln/detail/CVE-2017-7816
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2017-21
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2017-7816
https://bugzilla.mozilla.org/show_bug.cgi?id=1380597
https://www.mozilla.org/security/advisories/mfsa2017-21/
http://www.securityfocus.com/bid/101057
http://www.securitytracker.com/id/1039465
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
CVE-2017-7816 https://nvd.nist.gov/vuln/detail/CVE-2017-7816
mfsa2017-21 https://www.mozilla.org/en-US/security/advisories/mfsa2017-21
USN-3435-1 https://usn.ubuntu.com/3435-1/
No exploits are available.
Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2017-7816
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2017-7816
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.5055
EPSS Score 0.00272
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T13:16:44.048321+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2017/mfsa2017-21.yml 38.0.0