How severe is CVE-2018-4186?

CVE-2018-4186 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2018-4186 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-4186?

CVE-2018-4186 affects Apple Safari. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-4186?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-4186 published?

CVE-2018-4186 was published on 2019-01-11 and last updated on 2026-06-17.

CVE-2018-4186

CVE-2018-4186 is a high-severity vulnerability in Apple Safari with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Apple Safari
Published: 2019-01-11
Last modified: 2026-06-17

Description

In Safari before 11.1, an information leakage issue existed in the handling of downloads in Safari Private Browsing. This issue was addressed with additional validation.

Frequently asked questions

What is CVE-2018-4186?: In Safari before 11.1, an information leakage issue existed in the handling of downloads in Safari Private Browsing. This issue was addressed with additional validation.
How severe is CVE-2018-4186?: CVE-2018-4186 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2018-4186 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-4186?: CVE-2018-4186 affects Apple Safari. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-4186?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-4186 published?: CVE-2018-4186 was published on 2019-01-11 and last updated on 2026-06-17.

References

https://support.apple.com/HT208695

Affected products (1)

cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*

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