CVE-2020-26955
MediumCVSS 6.5Exploitation Probability (EPSS)
Elevated risk54th percentile - higher than 54% of all known CVEs
Summary
When a user downloaded a file in Firefox for Android, if a cookie is set, it would be re-sent during a subsequent file download on the same domain, regardless of private or non-private browsing modes. Affects Firefox < 83.
Risk Assessment
This could lead to unauthorized disclosure of cookies, potentially enabling session hijacking or user tracking.
Recommendation
Update Firefox for Android to version 83 or later.
Other vulnerabilities in Firefox for Android
See all- CVE-2023-29534Critical
In Firefox and Focus for Android, techniques were discovered to obscure the fullscreen notification, which could lead to user confusion and spoofing attacks. This affects Firefox for Android and Focus for Android versions prior to 112.
- CVE-2026-74975Medium
A spoofing issue exists in the Downloads component in Firefox for Android. This vulnerability was fixed in Firefox 154.
- CVE-2026-18809Medium
Information disclosure in Firefox for Android and Firefox Focus for Android. This vulnerability was fixed in Firefox 153.0.3.
- CVE-2026-16397Medium
Clickjacking vulnerability in the WebExtensions component in Firefox for Android. This issue was fixed in Firefox 153.
- CVE-2026-16373High
Vulnerability in the Privacy component in Firefox for Android. The flaw leads to information disclosure. The issue was fixed in Firefox 153.
- CVE-2023-29546Medium
When recording the screen while in Private Browsing on Firefox for Android, the address bar and keyboard were not hidden, potentially leaking sensitive information. This bug only affects Firefox for Android and Focus for Android versions prior to 112.
- CVE-2023-25747High
Potential use-after-free in libaudio, fixed by disabling AAudio backend on Android below version 30. Affects only Firefox for Android before 110.1.0.
- CVE-2022-38474Medium
A website that had permission to access the microphone could record audio without the audio notification being shown. This bug does not allow the attacker to bypass the permission prompt - it only affects the notification shown once permission has been granted. This bug only affects Firefox for Android. Other operating systems are unaffected. This vulnerability affects Firefox < 104.
- CVE-2020-26977Medium
By attempting to connect to a website using an unresponsive port, an attacker could control the content of a tab while the URL bar displayed the original domain. Affects Firefox for Android < 84.
- CVE-2020-26975Medium
A malicious app on the user's device could broadcast an Intent to Firefox for Android with arbitrary headers, leading to attacks such as abusing ambient authority or session fixation. This was fixed by only allowing certain safe-listed headers. Affects Firefox < 84.
Original NVD description (English source)
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.