CVE-2018-5116

moderate-risk
Published 2018-06-11

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.

Do I need to act?

-
0.46% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (4)

Affected Vendors

Mozilla Canonical

References (10)

Third Party Advisory http://www.securityfocus.com/bid/102786
Third Party Advisory http://www.securitytracker.com/id/1040270
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1396399
Third Party Advisory https://usn.ubuntu.com/3544-1/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2018-02/
Third Party Advisory http://www.securityfocus.com/bid/102786
Third Party Advisory http://www.securitytracker.com/id/1040270
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1396399
Third Party Advisory https://usn.ubuntu.com/3544-1/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2018-02/
44
/ 100
moderate-risk
Severity 32/34 · Critical
Exploitability 2/34 · Minimal
Exposure 10/34 · Low