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CVE-2020-26955

When a user downloaded a file in Firefox for Android, if a cookie is set, it would have been re...

6.5 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
High
Availability
None

Exploit likelihood

0.83%Up 0.2 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 6.5

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.

Record
CVE-2020-26955
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness
CWE-565
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2020-26955
Updated
2026-11-02
EUVDEUVD-2020-19479 No score

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.

Record
EUVD-2020-19479
Updated
2026-11-03
GitHub AdvisoriesGHSA-xvpg-g5h6-mqww 6.5

When a user downloaded a file in Firefox for Android, if a cookie is set, it would have been re...

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.

Record
GHSA-xvpg-g5h6-mqww
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Weakness
CWE-565
Updated
2026-11-02
OSVALPINE-CVE-2020-26955 6.5

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.

Record
ALPINE-CVE-2020-26955
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-03
OSVUBUNTU-CVE-2020-26955 6.5

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.

Record
UBUNTU-CVE-2020-26955
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVopenSUSE-SU-2024:10600-1 No score

MozillaFirefox-92.0-1.2 on GA media

These are all security issues fixed in the MozillaFirefox-92.0-1.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10600-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:14572-1 No score

firefox-esr-128.5.1-1.1 on GA media

These are all security issues fixed in the firefox-esr-128.5.1-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:14572-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
firefox
Alpine:v3.12
 before 83.0-r0
83.0-r0
firefox
Alpine:v3.13
 before 83.0-r0
83.0-r0
firefox
Alpine:v3.14
 before 83.0-r0
83.0-r0
firefox
Alpine:v3.15
 before 83.0-r0
83.0-r0
firefox
Alpine:v3.16
 before 83.0-r0
83.0-r0
firefox
Alpine:v3.17
 before 83.0-r0
83.0-r0
firefox
Alpine:v3.18
 before 83.0-r0
83.0-r0
firefox
Alpine:v3.19
 before 83.0-r0
83.0-r0
firefox
Alpine:v3.20
 before 83.0-r0
83.0-r0
firefox
Alpine:v3.21
 before 83.0-r0
83.0-r0
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Affected packages
PackageAffectedFixed
firefox
Alpine:v3.22
 before 83.0-r0
83.0-r0
firefox
Alpine:v3.23
 before 83.0-r0
83.0-r0
librewolf
Alpine:v3.21
 before 83.0-r0
83.0-r0
librewolf
Alpine:v3.22
 before 83.0-r0
83.0-r0
librewolf
Alpine:v3.23
 before 83.0-r0
83.0-r0
librewolf
Alpine:v3.24
 before 83.0-r0
83.0-r0
mozjs52
Ubuntu:18.04:LTS
 All versions, plus listed versions
52.3.1-0ubuntu352.3.1-7fakesync152.8.1-0ubuntu0.18.04.152.9.1-0ubuntu0.18.04.1
 None known
mozjs38
Ubuntu:18.04:LTS
 All versions, plus listed versions
38.8.0~repack1-0ubuntu138.8.0~repack1-0ubuntu338.8.0~repack1-0ubuntu4
 None known
mozjs68
Ubuntu:20.04:LTS
 All versions, plus listed versions
68.5.0-1~fakesync68.5.0-2~fakesync68.6.0-168.6.0-1ubuntu1
 None known
mozjs52
Ubuntu:20.04:LTS
 All versions, plus listed versions
52.9.1-1build152.9.1-1ubuntu3
 None known
MozillaFirefox
openSUSE:Tumbleweed
From an advisory covering 661 CVEs
 before 92.0-1.2
92.0-1.2
firefox-esr
openSUSE:Tumbleweed
From an advisory covering 1860 CVEs
 before 128.5.1-1.1
128.5.1-1.1

History

History
RecordedChangedSources
affected, facts
affected, aliases, referencesOSV
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-26955 is a medium vulnerability (CVSS 6.5) in Mozilla Firefox, published December 9, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.83%, the 57th percentile. Fixed in firefox 83.0-r0.

References

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