What is CVE-2019-5864?

CVE-2019-5864 is a medium-severity vulnerability in Google Chrome, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2019-11-25.

How severe is CVE-2019-5864?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Google Chrome

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2019-11-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (37.8th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 37.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Google Chrome — versions unspecified

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2019-5864?: CVE-2019-5864 is a medium-severity vulnerability in Google Chrome, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2019-11-25.
How severe is CVE-2019-5864?: Medium severity. CVSS v3 base score is 4.3 out of 10.