Is CVE-2018-18494 in the CISA KEV catalog?

No. CVE-2018-18494 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-18494?

CVE-2018-18494 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2018-18494?

CVE-2018-18494 has an EPSS score of 1.55% (72th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-18494?

Upgrade firefox on debian unstable to 64.0-1 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2018-18494

MEDIUMEPSS 72th pctl

6.5

CVSS v3

NVD

Description

A same-origin policy violation allowing the theft of cross-origin URL entries when using the Javascript location property to cause a redirection to another site using performance.getEntries(). This is a same-origin policy violation and could allow for data theft. This vulnerability affects Thunderbird < 60.4, Firefox ESR < 60.4, and Firefox < 64.

CWE-346

How to fix

Remediation Available

firefoxDebian

Fixed in:64.0-1CVE-2018-18494

firefoxUbuntu

Fixed in:64.0+build3-0ubuntu0.14.04.1USN-3844-1

Fixed in:64.0+build3-0ubuntu0.16.04.1USN-3844-1

Fixed in:64.0+build3-0ubuntu0.18.04.1USN-3844-1

thunderbirdUbuntu

Fixed in:1:60.4.0+build2-0ubuntu0.14.04.1USN-3868-1

Fixed in:1:60.4.0+build2-0ubuntu0.16.04.1USN-3868-1

Fixed in:1:60.4.0+build2-0ubuntu0.18.04.1USN-3868-1

DeveloperEditionWindows application

Affected:64.0Fixed in:64.0Mozilla

Affected:60.4.0Fixed in:60.4.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:64.0Fixed in:64.0Mozilla

Affected:60.4.0Fixed in:60.4.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:60.4.0Fixed in:60.4.0Mozilla

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 InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.55%probability of exploitation in 30 days

72ndpercentile

Elevated risk: more likely to be exploited than 72% of all known CVEs.

References

Vendor Advisory4

Third-Party Advisory11

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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.