CVE-2016-9900: Mozilla Firefox vulnerability

CVE-2016-9900: External resources that should be blocked when loaded by SVG images can bypass security restrictions throug...

External resources that should be blocked when loaded by SVG images can bypass security restrictions through the use of "data:" URLs. This could allow for cross-domain data leakage. This vulnerability affects Firefox < 50.1, Firefox ESR < 45.6, and Thunderbird < 45.6.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 03:07 UTC (UTC+00:00)

Security readout for executives and security teams

This is a data leakage bug in old Mozilla browser and mail software. An SVG image could use a data: URL to bypass restrictions meant to block external resources, creating cross-domain exposure. The provided sources identify affected versions, but not a CVSS score or active exploitation. Exposure is mainly legacy desktops, servers, or packaged environments still running affected Firefox, Firefox ESR, or Thunderbird versions. Modern supported installations should be checked, but the primary concern is outdated or frozen software images. Treat this as a moderate legacy-software cleanup item. It is not cited as actively exploited, but affected versions are very old and can expose cross-domain data, so unsupported Mozilla installations should be removed or updated promptly. Mitigation focus: Upgrade Firefox to 50.1 or later, or a current supported release.; Upgrade Firefox ESR to 45.6 or later, or a current supported ESR.; Upgrade Thunderbird to 45.6 or later, or a current supported release..

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

7Source 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/mfsa2016-94/CVE reference · x_refsource_CONFIRM
https://www.mozilla.org/security/advisories/mfsa2016-95/CVE reference · x_refsource_CONFIRM
https://bugzilla.mozilla.org/show_bug.cgi?id=1319122CVE reference · x_refsource_CONFIRM
GLSA-201701-15CVE reference · vendor-advisory, x_refsource_GENTOO
DSA-3757CVE reference · vendor-advisory, x_refsource_DEBIAN
https://www.mozilla.org/security/advisories/mfsa2016-96/CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

MozillaFirefoxunspecifiedListed

MozillaFirefox ESRunspecifiedListed

MozillaThunderbirdunspecifiedListed

Weakness

CWE details

No CWE listed

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