CVE-2016-9902: Mozilla Firefox ESR vulnerability

CVE-2016-9902: The Pocket toolbar button, once activated, listens for events fired from it's own pages but does not verify...

The Pocket toolbar button, once activated, listens for events fired from it's own pages but does not verify the origin of incoming events. This allows content from other origins to fire events and inject content and commands into the Pocket context. Note: this issue does not affect users with e10s enabled. This vulnerability affects Firefox ESR < 45.6 and Firefox < 50.1.

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

Security readout for executives and security teams

CVE-2016-9902 is an old Firefox Pocket integration flaw. When the Pocket toolbar button was activated, Firefox did not properly check where certain events came from, allowing other web content to inject content or commands into the Pocket context. The sources identify fixed thresholds as Firefox 50.1 and Firefox ESR 45.6. Exposure is most likely in legacy environments still running Firefox before 50.1 or Firefox ESR before 45.6 with the Pocket toolbar button activated and e10s not enabled. Modern supported Firefox deployments are unlikely to be exposed based on the listed fixed versions. Low operational urgency for supported browser fleets, but important for legacy cleanup. The business risk is concentrated in outdated Firefox installations, especially managed desktops, kiosks, or frozen server images that missed 2016-era browser security updates. Mitigation focus: Upgrade Firefox to 50.1 or later.; Upgrade Firefox ESR to 45.6 or later.; Check Mozilla and distribution advisories for vendor-specific package guidance..

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

5Source 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=1320039CVE reference · x_refsource_CONFIRM
GLSA-201701-15CVE reference · vendor-advisory, x_refsource_GENTOO

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

MozillaFirefox ESRunspecifiedListed

MozillaFirefoxunspecifiedListed

Weakness

CWE details

No CWE listed

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