CVE-2018-5138

Name: CVE-2018-5138
Creator: NVD / NIST
Published: 2018-06-11T21:29:14.483+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.11%

Last modified Jun 17, 2026

CVE-2018-5138 is a vulnerability of currently unknown severity. A spoofing vulnerability can occur when a malicious site with an extremely long domain name is opened in an Android Custom Tab (a browser panel inside another app) and the default browser is Firefox for Android. This could allow an attacker to spoof which page is actually loaded and in use. EPSS estimates a 1.11% chance of exploitation in the next 30 days.

Description

A spoofing vulnerability can occur when a malicious site with an extremely long domain name is opened in an Android Custom Tab (a browser panel inside another app) and the default browser is Firefox for Android. This could allow an attacker to spoof which page is actually loaded and in use. Note: this issue only affects Firefox for Android. Other versions and operating systems are unaffected. This vulnerability affects Firefox < 59.

Metrics

EPSS Probability

1.11%

61.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 59.0

References

http://www.securityfocus.com/bid/103386Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1040514Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1432624Issue Tracking, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-06/Vendor Advisory
http://www.securityfocus.com/bid/103386Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1040514Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1432624Issue Tracking, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-06/Vendor Advisory

Timeline

Published: Jun 11, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-5138?

How severe is CVE-2018-5138?

Severity scoring for CVE-2018-5138 is pending analysis. The EPSS model estimates a 1.11% probability of exploitation in the next 30 days.

How do I fix CVE-2018-5138?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-5138?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST