How severe is CVE-2019-5864?

CVE-2019-5864 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2019-5864 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-5864?

CVE-2019-5864 affects Google Chrome. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-5864?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-5864 published?

CVE-2019-5864 was published on 2019-11-25 and last updated on 2026-06-17.

CVE-2019-5864

CVE-2019-5864 is a medium-severity vulnerability in Google Chrome with a CVSS 3.x base score of 4.3. 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-20.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.3
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Google Chrome
Published: 2019-11-25
Last modified: 2026-06-17

Description

Insufficient data validation in CORS in Google Chrome prior to 76.0.3809.87 allowed an attacker who convinced a user to install a malicious extension to bypass content security policy via a crafted Chrome Extension.

Frequently asked questions

What is CVE-2019-5864?: Insufficient data validation in CORS in Google Chrome prior to 76.0.3809.87 allowed an attacker who convinced a user to install a malicious extension to bypass content security policy via a crafted Chrome Extension.
How severe is CVE-2019-5864?: CVE-2019-5864 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2019-5864 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-5864?: CVE-2019-5864 affects Google Chrome. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-5864?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-5864 published?: CVE-2019-5864 was published on 2019-11-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*

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