CVE-2016-9902

Q: How do I fix CVE-2016-9902?

Published advisories record a fix for 4 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Q: Is CVE-2016-9902 being actively exploited?

Not that we know of. CVE-2016-9902 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.3% is the estimated probability that it will be exploited in the next 30 days. That is higher than 69% of all scored CVEs.

Q: How severe is CVE-2016-9902?

CVE-2016-9902 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2016-9902 affect?

Published advisories record a fix for firefox (Debian), firefox (Ubuntu), DeveloperEdition (Windows application), Mozilla Firefox (en-US) (Windows application). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGH

7.5

CVSS v3

NVD

Description

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.

CWE-346

How to fix

Remediation Available

firefoxDebian

Fixed in:50.1.0-1CVE-2016-9902

firefoxUbuntu

Fixed in:50.1.0+build2-0ubuntu0.14.04.1USN-3155-1

Fixed in:50.1.0+build2-0ubuntu0.16.04.1USN-3155-1

DeveloperEditionWindows application

Affected:45.6.0Fixed in:45.6.0Mozilla

Affected:50.1Fixed in:50.1Mozilla

Mozilla Firefox (en-US)Windows application

Affected:45.6.0Fixed in:45.6.0Mozilla

Affected:50.1Fixed in:50.1Mozilla

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

1.32%probability of exploitation in 30 days

69thpercentile

Moderate risk: more likely to be exploited than 69% of all known CVEs.

References

Patch1

bugzilla.mozilla.org

Vendor Advisory2

Third-Party Advisory5

Related Vulnerabilities

Other CWE-346 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-34291	High	8.8	84%	KEV	-
CVE-2009-1185	High	7.2	82%	-	Fix
CVE-2015-4495	High	8.8	71%	KEV	Fix
CVE-2020-16952	High	8.6	71%	-	-
CVE-2023-29711	Critical	9.8	70%	-	-
CVE-2024-23898	High	8.8	67%	-	Fix

Common questions

How do I fix CVE-2016-9902?

Published advisories record a fix for 4 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2016-9902 being actively exploited?

Not that we know of. CVE-2016-9902 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.3% is the estimated probability that it will be exploited in the next 30 days. That is higher than 69% of all scored CVEs.

How severe is CVE-2016-9902?

CVE-2016-9902 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2016-9902 affect?

Published advisories record a fix for firefox (Debian), firefox (Ubuntu), DeveloperEdition (Windows application), Mozilla Firefox (en-US) (Windows application). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-25.