How severe is CVE-2026-16404?

CVE-2026-16404 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-16404 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-16404?

CVE-2026-16404 affects Mozilla Firefox Mobile. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-16404?

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-2026-16404 published?

CVE-2026-16404 was published on 2026-07-21 and last updated on 2026-07-24.

CVE-2026-16404

CVE-2026-16404 is a high-severity vulnerability in Mozilla Firefox Mobile with a CVSS 3.x base score of 7.4. 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-290.

Key facts

Severity: High (CVSS 3.x base score 7.4)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-290
Affected product: Mozilla Firefox Mobile
Published: 2026-07-21
Last modified: 2026-07-24

Description

Spoofing issue in Firefox for Android. This vulnerability was fixed in Firefox 153.

Frequently asked questions

What is CVE-2026-16404?: Spoofing issue in Firefox for Android. This vulnerability was fixed in Firefox 153.
How severe is CVE-2026-16404?: CVE-2026-16404 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-16404 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-16404?: CVE-2026-16404 affects Mozilla Firefox Mobile. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-16404?: 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-2026-16404 published?: CVE-2026-16404 was published on 2026-07-21 and last updated on 2026-07-24.

References

Affected products (1)

cpe:2.3:a:mozilla:firefox_mobile:*:*:*:*:*:android:*:*

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