CVE-2025-6428: firefox Open Redirect

Description

When a URL was provided in a link querystring parameter, Firefox for Android would follow that URL instead of the correct URL, potentially leading to phishing attacks. *This bug only affects Firefox for Android. Other versions of Firefox are unaffected.*. This vulnerability was fixed in Firefox 140.

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CVSS v3.1 Score

4.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Weakness Type (CWE)

CWE-601 CWE-601

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 140.0
google	android	All

References

Advisories & Patches

https://bugzilla.mozilla.org/show_bug.cgi?id=1970151 https://www.mozilla.org/security/advisories/mfsa2025-51/

Exploits

https://bugzilla.mozilla.org/show_bug.cgi?id=1970151

Frequently Asked Questions

What is CVE-2025-6428? +

When a URL was provided in a link querystring parameter, Firefox for Android would follow that URL instead of the correct URL, potentially leading to phishing attacks. *This bug only affects Firefox for Android. Other versions of Firefox are unaffected.*. This vulnerability was fixed in Firefox 140. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2025-6428? +

CVE-2025-6428 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-6428? +

CVE-2025-6428 affects products from google, mozilla, specifically: android, firefox. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-6428? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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