CVE-2018-5135

Name: CVE-2018-5135
Creator: NVD / NIST
Published: 2018-06-11T21:29:14.327+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.55%

Last modified Jun 17, 2026

CVE-2018-5135 is a vulnerability of currently unknown severity. WebExtensions can bypass normal restrictions in some circumstances and use "browser.tabs.executeScript" to inject scripts into contexts where this should not be allowed, such as pages from other WebExtensions or unprivileged "about:" pages. This vulnerability affects Firefox < 59.. EPSS estimates a 1.55% chance of exploitation in the next 30 days.

Description

WebExtensions can bypass normal restrictions in some circumstances and use "browser.tabs.executeScript" to inject scripts into contexts where this should not be allowed, such as pages from other WebExtensions or unprivileged "about:" pages. This vulnerability affects Firefox < 59.

Metrics

EPSS Probability

1.55%

71.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-862

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=1431371Permissions Required
https://usn.ubuntu.com/3596-1/Third Party 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=1431371Permissions Required
https://usn.ubuntu.com/3596-1/Third Party 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-2018-5135?

How severe is CVE-2018-5135?

Severity scoring for CVE-2018-5135 is pending analysis. The EPSS model estimates a 1.55% probability of exploitation in the next 30 days.

How do I fix CVE-2018-5135?

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-2018-5135?

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

Scan your code now

Source: NVD / NIST