CVE-2017-7770

5.9 mediumEPSS 1.1%

Medium (5.9) in mozilla firefox. EPSS 1.1% chance of exploitation in the next 30 days.

A mechanism where when a new tab is loaded through JavaScript events, if fullscreen mode is then entered, the addressbar will not be rendered. This would allow a malicious site to displayed a spoofed addressbar, showing the location of an arbitrary website instead of the one loaded. Note: this issue only affects Firefox for Android. Desktop Firefox is unaffected. This vulnerability affects Firefox < 54.

Severity

CVSS 3.0

5.9 medium

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS: 1.1% chance of exploitation in the next 30 days; higher than 65% of CVEs (scores of 2026-10-31)
CWE: CWE-20
Published: 2018-06-11
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mozilla:firefox

References

http://www.securityfocus.com/bid/99049
http://www.securitytracker.com/id/1038689
https://bugzilla.mozilla.org/show_bug.cgi?id=1317242
https://www.mozilla.org/security/advisories/mfsa2017-15/
http://www.securityfocus.com/bid/99049

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