How severe is CVE-2015-4498?

CVE-2015-4498 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2015-4498 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-4498?

CVE-2015-4498 primarily affects Mozilla Firefox. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-4498?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2015-4498 published?

CVE-2015-4498 was published on 2015-08-29 and last updated on 2026-06-17.

CVE-2015-4498

CVE-2015-4498 is a high-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-254.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-254
Affected product: Mozilla Firefox
Published: 2015-08-29
Last modified: 2026-06-17

Description

The add-on installation feature in Mozilla Firefox before 40.0.3 and Firefox ESR 38.x before 38.2.1 allows remote attackers to bypass an intended user-confirmation requirement by constructing a crafted data: URL and triggering navigation to an arbitrary http: or https: URL at a certain early point in the installation process.

Frequently asked questions

What is CVE-2015-4498?: The add-on installation feature in Mozilla Firefox before 40.0.3 and Firefox ESR 38.x before 38.2.1 allows remote attackers to bypass an intended user-confirmation requirement by constructing a crafted data: URL and triggering navigation to an arbitrary http: or https: URL at a certain early point in the installation process.
How severe is CVE-2015-4498?: CVE-2015-4498 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2015-4498 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-4498?: CVE-2015-4498 primarily affects Mozilla Firefox. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-4498?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2015-4498 published?: CVE-2015-4498 was published on 2015-08-29 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:38.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:38.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:38.0.5:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:38.1.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:38.2.0:*:*:*:*:*:*:*

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