CVE-2025-6431Public exploitNetwork attack vector

External app launch via onblur prompt bypass

Published Jun 24, 2025 · Updated Apr 13, 2026

Improper authorization in Mozilla Firefox for Android before 140 allows remote attackers to launch external apps through crafted links. A window.onblur handler dispatches an Android intent while Firefox continues loading before awaiting the app-link prompt response, suppressing the confirmation dialog. A remote attacker must lure a user to a crafted page and induce a tap on a normal browser control; the resulting intent opens an installed external app without consent.

CVSS severity6.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Mozilla Firefox for Android before 140 allows remote attackers to launch external apps through crafted links. A window.onblur handler dispatches an Android intent while Firefox continues loading before awaiting the app-link prompt response, suppressing the confirmation dialog. A remote attacker must lure a user to a crafted page and induce a tap on a normal browser control; the resulting intent opens an installed external app without consent.

The record

CVE
CVE-2025-6431
Published
Jun 24, 2025
Updated
Apr 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-285, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
6.5UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-285Improper Authorization
T1204.001User Execution: Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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