Vulnerability identifier: #VU10978

Vulnerability risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-5135

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mozilla Firefox
Client/Desktop applications / Web browsers

Vendor: Mozilla

Description
The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to improper sanitization of user-supplied input. A remote attacker can supply WebExtensions to 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.

Mitigation
Update to version 59.0.

Vulnerable software versions

Mozilla Firefox: 58.0

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External links
http://www.mozilla.org/en-US/security/advisories/mfsa2018-06/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.