CVE-2020-26955

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-12-09 · updated 2026-08-19
Weakness: CWE-565

Description

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.

Affected products

Mozilla Firefox for Android: before 83.0 — fixed in 83.0

How to fix

Upgrade to a fixed version: Mozilla Firefox for Android 83.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1663261
https://www.mozilla.org/security/advisories/mfsa2020-50/
https://bugzilla.mozilla.org/show_bug.cgi?id=1663261
https://www.mozilla.org/security/advisories/mfsa2020-50/

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