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CVE-2017-7791

Mozilla: Spoofing following page navigation with data: protocol and modal alerts (MFSA 2017-19)

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Severity

Moderate

Red Hat Product Security

5.3

CVSS 3.0

Review impact separately from score.

Published · August 8, 2017

Updated · November 26, 2025

Description

On pages containing an iframe, the "data:" protocol can be used to create a modal alert that will render over arbitrary domains following page navigation, spoofing of the origin of the modal alert from the iframe content. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 5.3
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CWE-829 · Inclusion of Functionality from Untrusted Control Sphere