CVE-2025-6428Public exploitNetwork attack vector

Phishing redirects via query parameter fallback

Published Jun 24, 2025 · Updated Apr 13, 2026

Open redirect in Mozilla Firefox for Android before 140 allows remote attackers to send users to an attacker-controlled site through a crafted URL. AppLinksUseCases.getHierarchicalUrl treated the untrusted afl or link query parameter as a fallback URL when an external app could not handle the original URL. Exploitation requires a user to open or tap the crafted link, after which the apparent destination domain can differ from the site Firefox loads, enabling phishing.

CVSS severity4.3
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in Mozilla Firefox for Android before 140 allows remote attackers to send users to an attacker-controlled site through a crafted URL. AppLinksUseCases.getHierarchicalUrl treated the untrusted afl or link query parameter as a fallback URL when an external app could not handle the original URL. Exploitation requires a user to open or tap the crafted link, after which the apparent destination domain can differ from the site Firefox loads, enabling phishing.

The record

CVE
CVE-2025-6428
Published
Jun 24, 2025
Updated
Apr 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-601, 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

4.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
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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