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CVE-2018-12370

27
FAUCET Score

CVE-2018-12370 is a high-severity vulnerability affecting Mozilla Firefox versions prior to 61, including those distributed with Canonical Ubuntu Linux. It involves a bypass of SameSite cookie protections in Reader View, allowing a malicious site to trigger a payload and bypass CSRF protections when a user exits Reader View. The vulnerability has a CVSS score of 8.8, indicating a high potential for impact on confidentiality, integrity, and availability, with a network-based attack requiring user interaction but low attack complexity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
17.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*
18.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
< 61.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.13%
Probability of exploitation in next 30 days
EPSS Percentile
62.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0113 is in the 62nd percentile among its peer group of 14,875 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

mozillapatch availablevia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2018-12370Low

Mozilla: SameSite cookie protections bypassed when exiting Reader View

Jun 26, 2018

References

bugzilla.mozilla.org / show_bug.cgi
Issue TrackingPatchVendor Advisory
security.gentoo.org / glsa/201810-01
Third Party Advisory
usn.ubuntu.com / 3705-1
Third Party Advisory
mozilla.org / security/advisories/mfsa2018-15
Vendor Advisory
securitytracker.com / id/1041193
Third Party AdvisoryVDB Entry