CVE-2017-7815: Mozilla Firefox vulnerability

CVE-2017-7815: On pages containing an iframe, the "data:" protocol can be used to create a modal dialog through Javascript...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 5, 2024, 16:12 UTC (UTC+00:00)

Security readout for executives and security teams

This is a Firefox user-interface spoofing issue. In affected Firefox versions, a page with an iframe could make a JavaScript modal dialog appear to come from an arbitrary domain, misleading users about the dialog’s origin. The source states it affects Firefox before 56 and only when e10s multiprocess is turned off. Exposure is most likely in legacy Firefox deployments older than version 56, especially where e10s multiprocess was disabled. Current, centrally managed, auto-updated browsers are unlikely to be exposed based on the affected-version statement. Treat this as a legacy-browser cleanup issue unless old Firefox versions remain in use. The business risk is user deception leading to credential or trust abuse, not direct system compromise from the provided evidence. Mitigation focus: Upgrade affected Firefox installations to version 56 or later.; Confirm legacy Firefox deployments do not have e10s multiprocess disabled.; Review Mozilla advisory MFSA2017-21 for vendor-specific remediation details..

Prepared: Jun 7, 2026, 06:44 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jun 11, 2018, 21:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://www.mozilla.org/security/advisories/mfsa2017-21/CVE reference · x_refsource_CONFIRM
https://bugzilla.mozilla.org/show_bug.cgi?id=1368981CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

MozillaFirefoxunspecifiedListed

Weakness

CWE details

No CWE listed

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