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

• https://nvd.nist.gov/vuln/detail/CVE-2021-29971
• https://bugzilla.mozilla.org/show_bug.cgi?id=1713638
• https://www.mozilla.org/security/advisories/mfsa2021-28/