CVE-2018-5135

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.

Category

7.5
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 1.16% Top 25%
Vendor Advisory ubuntu.com Vendor Advisory mozilla.org
Affected: Mozilla Firefox
Published at:
Updated at:

References

Link Tags
http://www.securityfocus.com/bid/103386 vdb entry third party advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1431371 permissions required
http://www.securitytracker.com/id/1040514 vdb entry third party advisory
https://usn.ubuntu.com/3596-1/ third party advisory vendor advisory
https://www.mozilla.org/security/advisories/mfsa2018-06/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2018-5135?
CVE-2018-5135 has been scored as a high severity vulnerability.
How to fix CVE-2018-5135?
To fix CVE-2018-5135, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-5135 being actively exploited in the wild?
It is possible that CVE-2018-5135 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2018-5135?
CVE-2018-5135 affects Mozilla Firefox.
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