CVE-2018-12370

Severity: high (CVSS 8.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-10-18 · updated 2026-06-17
Weakness: CWE-352

Description

In Reader View SameSite cookie protections are not checked on exiting. This allows for a payload to be triggered when Reader View is exited if loaded by a malicious site while Reader mode is active, bypassing CSRF protections. This vulnerability affects Firefox < 61.

Affected products

Canonical Ubuntu Linux: 14.04, 16.04, 17.10, 18.04
Mozilla Firefox: before 61.0 — fixed in 61.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 61.0. Check the vendor advisory for mitigations.

References

http://www.securitytracker.com/id/1041193
https://bugzilla.mozilla.org/show_bug.cgi?id=1456652
https://security.gentoo.org/glsa/201810-01
https://usn.ubuntu.com/3705-1/
https://www.mozilla.org/security/advisories/mfsa2018-15/
http://www.securitytracker.com/id/1041193
https://bugzilla.mozilla.org/show_bug.cgi?id=1456652
https://security.gentoo.org/glsa/201810-01
https://usn.ubuntu.com/3705-1/
https://www.mozilla.org/security/advisories/mfsa2018-15/

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