When a user downloaded a file in Firefox for Android, if a cookie is set, it would have been re-sent during a subsequent file download operation on the same domain, regardless of whether the original and subsequent request were in private and non-private browsing modes. Note: This issue only affected Firefox for Android. Other operating systems are unaffected.. This vulnerability affects Firefox < 83.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-26955
• https://bugzilla.mozilla.org/show_bug.cgi?id=1663261
• https://www.mozilla.org/security/advisories/mfsa2020-50/