Is CVE-2018-12397 in the CISA KEV catalog?

No. CVE-2018-12397 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-12397?

CVE-2018-12397 has a CVSS v3 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2018-12397?

CVE-2018-12397 has an EPSS score of 0.37% (29th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-12397?

Upgrade firefox on debian unstable to 63.0-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2018-12397

HIGH

7.1

CVSS v3

NVD

Description

A WebExtension can request access to local files without the warning prompt stating that the extension will "Access your data for all websites" being displayed to the user. This allows extensions to run content scripts in local pages without permission warnings when a local file is opened. This vulnerability affects Firefox ESR < 60.3 and Firefox < 63.

CWE-200Information Exposure

How to fix

Remediation Available

firefoxDebian

Fixed in:63.0-1CVE-2018-12397

firefoxUbuntu

Fixed in:63.0+build2-0ubuntu0.14.04.2USN-3801-1

Fixed in:63.0+build2-0ubuntu0.16.04.2USN-3801-1

Fixed in:63.0+build2-0ubuntu0.18.04.2USN-3801-1

DeveloperEditionWindows application

Affected:63.0Fixed in:63.0Mozilla

Affected:60.3.0Fixed in:60.3.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:63.0Fixed in:63.0Mozilla

Affected:60.3.0Fixed in:60.3.0Mozilla

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 VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.37%probability of exploitation in 30 days

29thpercentile

Low risk: more likely to be exploited than 29% of all known CVEs.

References

Vendor Advisory3

Third-Party Advisory8

Related Vulnerabilities

Other CWE-200 (Information Exposure) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-24919	High	8.6	100%	KEV + Ransom	-
CVE-2020-14181	Medium	5.3	100%	-	Fix
CVE-2021-34429	Medium	5.3	99%	-	Fix
CVE-2018-11409	Medium	5.3	98%	-	-
CVE-2021-41277	Critical	10.0	97%	KEV	-
CVE-2016-2183	High	7.5	96%	-	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.