CVE-2021-29971

CRITICAL

Firefox for Android < 90.0 - Permission Bypass via Same-Host Scheme/Port Confusion

Title source: llm
STIX 2.1

Description

If a user had granted a permission to a webpage and saved that grant, any webpage running on the same host - irrespective of scheme or port - would be granted that permission. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 90.

References (2)

Core 2
Core References
Issue Tracking, Permissions Required x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1713638

Scores

CVSS v3 9.8
EPSS 0.0102
EPSS Percentile 58.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-281
Status published
Products (1)
mozilla/firefox < 90.0
Published Aug 05, 2021
Tracked Since Feb 18, 2026