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Fencer Vulns
medium 6.5

CVE-2018-6099 json

A lack of CORS checks in Blink in Google Chrome prior to 66.0.3359.117 allowed a remote attacker to leak limited cross-origin data via a cr…

published 2018-12-04 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-17862

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

A lack of CORS checks in Blink in Google Chrome prior to 66.0.3359.117 allowed a remote attacker to leak limited cross-origin data via a crafted HTML page.

Patch / fix

  • Google Chrome 66.0.3359.117
  • chromium-browser Ubuntu 16.04 LTS 66.0.3359.139-0ubuntu0.16.04.3
  • chromium-browser Ubuntu 18.04 LTS 66.0.3359.139-0ubuntu0.18.04.3

ubuntu advisories UBUNTU-CVE-2018-6099

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • chromium-browser RHEL 6 EXTRAS 66.0.3359.117-1.el6_9

red hat advisories RHSA-2018:1195

  • chromium openSUSE Tumbleweed 93.0.4577.82-1.1
  • chromium openSUSE Tumbleweed 113.0.5672.92-1.1
  • chromium Package Hub 12 SP2 66.0.3359.181-55.1

opensuse advisories openSUSE-SU-2024:10681-1openSUSE-SU-2024:12948-1openSUSE-SU-2018:1175-1openSUSE-SU-2018:1437-1

  • chromium Arch Linux 66.0.3359.117-1

arch linux advisories AVG-678

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-6099 updated cvss 6.5

chromium-browser: CORS bypass in ServiceWorker

  • Red Hat Enterprise Linux Desktop Supplementary (v. 6) chromium-browser 66.0.3359.117-1.el6_9 Red Hat Enterprise Linux Server Supplementary (v. 6) chromium-browser 66.0.3359.117-1.el6_9 Red Hat Enterprise Linux Workstation Supplementary (v. 6) chromium-browser 66.0.3359.117-1.el6_9
    fixed: vendor fix RHSA-2018:1195

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.60% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • Google Chrome

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.