How severe is CVE-2025-1939?

CVE-2025-1939 has a CVSS 3.x base score of 3.9, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-1939 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-1939?

CVE-2025-1939 affects Mozilla Firefox. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-1939?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-1939 have an EU (EUVD) identifier?

Yes. CVE-2025-1939 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-6162.

When was CVE-2025-1939 published?

CVE-2025-1939 was published on 2025-03-04 and last updated on 2026-06-17.

CVE-2025-1939

CVE-2025-1939 is a low-severity vulnerability in Mozilla Firefox with a CVSS 3.x base score of 3.9. 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-359.

Key facts

Severity: Low (CVSS 3.x base score 3.9)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-6162
Weakness: CWE-359
Affected product: Mozilla Firefox
Published: 2025-03-04
Last modified: 2026-06-17

Description

Android apps can load web pages using the Custom Tabs feature. This feature supports a transition animation that could have been used to trick a user into granting sensitive permissions by hiding what the user was actually clicking. This vulnerability was fixed in Firefox 136.

Frequently asked questions

What is CVE-2025-1939?: Android apps can load web pages using the Custom Tabs feature. This feature supports a transition animation that could have been used to trick a user into granting sensitive permissions by hiding what the user was actually clicking. This vulnerability was fixed in Firefox 136.
How severe is CVE-2025-1939?: CVE-2025-1939 has a CVSS 3.x base score of 3.9, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-1939 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-1939?: CVE-2025-1939 affects Mozilla Firefox. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-1939?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-1939 have an EU (EUVD) identifier?: Yes. CVE-2025-1939 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-6162.
When was CVE-2025-1939 published?: CVE-2025-1939 was published on 2025-03-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

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