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CVE-2018-18351

22
FAUCET Score

CVE-2018-18351 describes a vulnerability in Google Chrome versions prior to 71.0.3578.80, also affecting Debian and Red Hat, where improper validation of ancestor frames allowed a remote attacker to bypass SameSite cookie policy through a crafted HTML page. This medium-severity vulnerability (CVSS 6.5) has a low attack complexity and could lead to high confidentiality impact, but no integrity or availability impact. While there is no evidence of active exploitation, no public exploit code, and it is not listed in CISA's KEV catalog, it has garnered some community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 71.0.3578.80CPE matchmatch criteria
cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
6.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
6.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
6.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.55%
Probability of exploitation in next 30 days
EPSS Percentile
83.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0255 is in the 92nd percentile among its peer group of 26,236 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6 SupplementaryFixed in: chromium-browser-0:71.0.3578.80-1.el6_10
View patch

Vendor Advisories (1)

redhatCVE-2018-18351Moderate

chromium-browser: Insufficient policy enforcement in Navigation

Dec 4, 2018

References

access.redhat.com / errata/RHSA-2018:3803
chromereleases.googleblog.com / 2018/12/stable-channel-update-for-desktop.html
crbug.com / 833847
security.gentoo.org / glsa/201908-18
debian.org / security/2018/dsa-4352
securityfocus.com / bid/106084