CVE-2016-9078: Mozilla Firefox vulnerability

CVE-2016-9078: Redirection from an HTTP connection to a "data:" URL assigns the referring site's origin to the "data:" URL...

Redirection from an HTTP connection to a "data:" URL assigns the referring site's origin to the "data:" URL in some circumstances. This can result in same-origin violations against a domain if it loads resources from malicious sites. Cross-origin setting of cookies has been demonstrated without the ability to read them. Note: This issue only affects Firefox 49 and 50. This vulnerability affects Firefox < 50.0.1.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 02:42 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2016-9078 is a Firefox browser origin-handling flaw. In Firefox 49 and 50, an HTTP redirect to a data: URL could sometimes make the data: content inherit the referring site’s origin, creating same-origin violations. Mozilla notes cross-origin cookie setting was demonstrated, but not cookie reading. Exposure is mainly legacy desktop environments still running Firefox 49 or 50, or unmanaged systems frozen below Firefox 50.0.1. Modern Firefox deployments should not be exposed based on the provided affected-version statement. Treat this as a targeted legacy-browser cleanup item, not a broad emergency. Prioritize it if regulated, kiosk, VDI, or unmanaged endpoints may still run old Firefox builds against sensitive sites. Mitigation focus: Upgrade Firefox to version 50.0.1 or later.; Remove or isolate Firefox 49 and 50 from managed endpoints.; Check Mozilla advisory guidance for any version-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/mfsa2016-91/CVE reference · x_refsource_CONFIRM
https://bugzilla.mozilla.org/show_bug.cgi?id=1317641CVE 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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