Is CVE-2018-12369 in the CISA KEV catalog?

No. CVE-2018-12369 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-12369?

CVE-2018-12369 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2018-12369?

CVE-2018-12369 has an EPSS score of 2.52% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-12369?

Upgrade firefox on debian unstable to 61.0-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2018-12369

CRITICALEPSS 83th pctl

9.8

CVSS v3

NVD

Description

WebExtensions bundled with embedded experiments were not correctly checked for proper authorization. This allowed a malicious WebExtension to gain full browser permissions. This vulnerability affects Firefox ESR < 60.1 and Firefox < 61.

CWE-863Incorrect Authorization

How to fix

Remediation Available

firefoxDebian

Fixed in:61.0-1CVE-2018-12369

firefoxUbuntu

Fixed in:61.0+build3-0ubuntu0.14.04.2USN-3705-1

Fixed in:61.0+build3-0ubuntu0.16.04.2USN-3705-1

Fixed in:61.0+build3-0ubuntu0.18.04.1USN-3705-1

DeveloperEditionWindows application

Affected:60.1.0Fixed in:60.1.0Mozilla

Affected:61.0Fixed in:61.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:61.0Fixed in:61.0Mozilla

Affected:60.1.0Fixed in:60.1.0Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.52%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Vendor Advisory3

Third-Party Advisory4

Related Vulnerabilities

Other CWE-863 (Incorrect Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-22518	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-38035	Critical	9.8	100%	KEV + Ransom	-
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2025-29927	Critical	9.1	100%	-	Fix
CVE-2024-38856	Critical	9.8	99%	KEV	Fix
CVE-2020-36289	Medium	5.3	99%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-25.