On pages containing an iframe, the "data:" protocol can be used to create a modal dialog through Javascript that will have an arbitrary dom…

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16790

cvss: 5.3; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits: 0; none known

On pages containing an iframe, the "data:" protocol can be used to create a modal dialog through Javascript that will have an arbitrary domains as the dialog's location, spoofing of the origin of the modal dialog from the user view. Note: This attack only affects installations with e10 multiprocess turned off. Installations with e10s turned on do not support the modal dialog functionality. This vulnerability affects Firefox < 56.

Patch / fix

fixed in 1 distros 2

Mozilla Firefox 56

ubuntu opensuse

firefox Ubuntu 14.04 LTS 56.0+build6-0ubuntu0.14.04.1
firefox Ubuntu 16.04 LTS 56.0+build6-0ubuntu0.16.04.1
firefox Ubuntu 18.04 LTS 56.0+build6-0ubuntu1

ubuntu advisories UBUNTU-CVE-2017-7815

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

firefox-esr openSUSE Tumbleweed 128.5.1-1.1
MozillaFirefox openSUSE Tumbleweed 92.0-1.2

opensuse advisories openSUSE-SU-2024:14572-1 openSUSE-SU-2024:10600-1

Exploit prediction

1.14% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1368981 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	5.3	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:P/A:N

Affected products

Mozilla Firefox

Classification

Weakness

CWE-20 Improper Input Validation

References

bugzilla.mozilla.org /show_bug.cgi?id=1368981
exploit, issue-tracking
mozilla.org /security/advisories/mfsa2017-21/
vendor-advisory
securitytracker.com /id/1039465
vdb-entry, third-party-advisory
securityfocus.com /bid/101057
vdb-entry, third-party-advisory

Sources

CVE List CVE-2017-7815
NVD CVE-2017-7815

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary