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Vulnerability details: VCID-q77g-61yn-tkcz
Vulnerability ID VCID-q77g-61yn-tkcz
Aliases CVE-2018-12396
Summary A vulnerability where a WebExtension can run content scripts in disallowed contexts following navigation or other events. This allows for potential privilege escalation by the WebExtension on sites where content scripts should not be run.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-732 Incorrect Permission Assignment for Critical Resource
CWE-284 Improper Access Control
System Score Found at
cvssv3 6.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-12396.json
epss 0.00716 https://api.first.org/data/v1/epss?cve=CVE-2018-12396
epss 0.00716 https://api.first.org/data/v1/epss?cve=CVE-2018-12396
epss 0.00716 https://api.first.org/data/v1/epss?cve=CVE-2018-12396
epss 0.00716 https://api.first.org/data/v1/epss?cve=CVE-2018-12396
epss 0.00716 https://api.first.org/data/v1/epss?cve=CVE-2018-12396
epss 0.00716 https://api.first.org/data/v1/epss?cve=CVE-2018-12396
epss 0.00716 https://api.first.org/data/v1/epss?cve=CVE-2018-12396
epss 0.00716 https://api.first.org/data/v1/epss?cve=CVE-2018-12396
epss 0.00716 https://api.first.org/data/v1/epss?cve=CVE-2018-12396
epss 0.00716 https://api.first.org/data/v1/epss?cve=CVE-2018-12396
epss 0.00716 https://api.first.org/data/v1/epss?cve=CVE-2018-12396
epss 0.00716 https://api.first.org/data/v1/epss?cve=CVE-2018-12396
epss 0.00716 https://api.first.org/data/v1/epss?cve=CVE-2018-12396
cvssv3 6.1 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2018-12396
cvssv3 6.5 https://nvd.nist.gov/vuln/detail/CVE-2018-12396
archlinux Critical https://security.archlinux.org/AVG-787
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2018-26
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2018-27
Reference id Reference type URL
https://access.redhat.com/errata/RHSA-2018:3005
https://access.redhat.com/errata/RHSA-2018:3006
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-12396.json
https://api.first.org/data/v1/epss?cve=CVE-2018-12396
https://bugzilla.mozilla.org/show_bug.cgi?id=1483602
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12389
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12390
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12392
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12393
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12395
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12396
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12397
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://lists.debian.org/debian-lts-announce/2018/11/msg00008.html
https://security.gentoo.org/glsa/201811-04
https://www.debian.org/security/2018/dsa-4324
https://www.mozilla.org/security/advisories/mfsa2018-26/
https://www.mozilla.org/security/advisories/mfsa2018-27/
http://www.securityfocus.com/bid/105718
http://www.securitytracker.com/id/1041944
1642186 https://bugzilla.redhat.com/show_bug.cgi?id=1642186
ASA-201810-14 https://security.archlinux.org/ASA-201810-14
AVG-787 https://security.archlinux.org/AVG-787
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:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
CVE-2018-12396 https://nvd.nist.gov/vuln/detail/CVE-2018-12396
mfsa2018-26 https://www.mozilla.org/en-US/security/advisories/mfsa2018-26
mfsa2018-27 https://www.mozilla.org/en-US/security/advisories/mfsa2018-27
USN-3801-1 https://usn.ubuntu.com/3801-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-12396.json
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
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
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
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2018-12396
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:R/S:U/C:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2018-12396
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 0.71464
EPSS Score 0.00716
Published At Aug. 4, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:54.753619+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2018/mfsa2018-27.yml 37.0.0