CVE-2018-5116

Name: CVE-2018-5116
Creator: NVD / NIST
Published: 2018-06-11T21:29:13.53+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.13%

Last modified Jun 17, 2026

CVE-2018-5116 is a vulnerability of currently unknown severity. WebExtensions with the "ActiveTab" permission are able to access frames hosted within the active tab even if the frames are cross-origin. Malicious extensions can inject frames from arbitrary origins into the loaded page and then interact with them, bypassing same-origin user expectations with this permission. EPSS estimates a 1.13% chance of exploitation in the next 30 days.

Description

WebExtensions with the "ActiveTab" permission are able to access frames hosted within the active tab even if the frames are cross-origin. Malicious extensions can inject frames from arbitrary origins into the loaded page and then interact with them, bypassing same-origin user expectations with this permission. This vulnerability affects Firefox < 58.

Metrics

EPSS Probability

1.13%

62.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-346

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	<= 57.0.4
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	17.10

References

http://www.securityfocus.com/bid/102786Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1040270Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1396399Issue Tracking, Permissions Required
https://usn.ubuntu.com/3544-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-02/Vendor Advisory
http://www.securityfocus.com/bid/102786Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1040270Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1396399Issue Tracking, Permissions Required
https://usn.ubuntu.com/3544-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-02/Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2018-5116?

How severe is CVE-2018-5116?

Severity scoring for CVE-2018-5116 is pending analysis. The EPSS model estimates a 1.13% probability of exploitation in the next 30 days.

How do I fix CVE-2018-5116?

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-2018-5116?

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

Scan your code now

Source: NVD / NIST