CVE-2025-8364: Address bar spoofing using an blob URI on Firefox for Android

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-08-19 · updated 2026-10-05
Weakness: CWE-451

Description

A crafted URL using a blob: URI could have hidden the true origin of the page, resulting in a potential spoofing attack. *Note: This issue only affected Android operating systems. Other operating systems are unaffected.*. This vulnerability was fixed in Firefox 141.

Affected products

Mozilla Firefox: before 141.0 — fixed in 141.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 141.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1909609
https://bugzilla.mozilla.org/show_bug.cgi?id=1969937
https://www.mozilla.org/security/advisories/mfsa2025-56/

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