CVE-2020-26953

medium
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Description

It was possible to cause the browser to enter fullscreen mode without displaying the security UI; thus making it possible to attempt a phishing attack or otherwise confuse the user. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1656741

https://www.mozilla.org/security/advisories/mfsa2020-50/

https://www.mozilla.org/security/advisories/mfsa2020-51/

https://www.mozilla.org/security/advisories/mfsa2020-52/

Details

Source: MITRE

Published: 2020-12-09

Updated: 2020-12-10

Type: CWE-1021

Risk Information

CVSS v2

Base Score: 4.3

Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N

Impact Score: 2.9

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3

Base Score: 4.3

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Impact Score: 1.4

Exploitability Score: 2.8

Severity: MEDIUM

Tenable Plugins

View all (54 total)

IDNameProductFamilySeverity
150523SUSE SLES11 Security Update : MozillaFirefox (SUSE-SU-2020:14548-1)NessusSuSE Local Security Checks
high
149335NewStart CGSL CORE 5.04 / MAIN 5.04 : thunderbird Multiple Vulnerabilities (NS-SA-2021-0025)NessusNewStart CGSL Local Security Checks
high
147399NewStart CGSL CORE 5.04 / MAIN 5.04 : firefox Multiple Vulnerabilities (NS-SA-2021-0018)NessusNewStart CGSL Local Security Checks
high
147352NewStart CGSL MAIN 6.02 : firefox Multiple Vulnerabilities (NS-SA-2021-0065)NessusNewStart CGSL Local Security Checks
high
147286NewStart CGSL MAIN 6.02 : thunderbird Multiple Vulnerabilities (NS-SA-2021-0081)NessusNewStart CGSL Local Security Checks
high
146200Oracle Linux 6 : firefox (ELSA-2020-5257)NessusOracle Linux Local Security Checks
high
146197Oracle Linux 6 : thunderbird (ELSA-2020-5238)NessusOracle Linux Local Security Checks
high
145963CentOS 8 : firefox (CESA-2020:5237)NessusCentOS Local Security Checks
high
145368openSUSE Security Update : MozillaFirefox (openSUSE-2020-2315)NessusSuSE Local Security Checks
high
145070RHEL 8 : firefox (RHSA-2020:5314)NessusRed Hat Local Security Checks
high
144798Amazon Linux 2 : thunderbird (ALAS-2021-1586)NessusAmazon Linux Local Security Checks
high
144004CentOS 7 : firefox (CESA-2020:5239)NessusCentOS Local Security Checks
high
143910CentOS 7 : thunderbird (CESA-2020:5235)NessusCentOS Local Security Checks
high
143745SUSE SLED15 / SLES15 Security Update : MozillaFirefox (SUSE-SU-2020:3383-1)NessusSuSE Local Security Checks
high
143741SUSE SLES12 Security Update : MozillaFirefox (SUSE-SU-2020:3548-1)NessusSuSE Local Security Checks
high
143723SUSE SLED15 / SLES15 Security Update : MozillaFirefox (SUSE-SU-2020:3458-1)NessusSuSE Local Security Checks
high
143540openSUSE Security Update : MozillaThunderbird (openSUSE-2020-2187)NessusSuSE Local Security Checks
high
143531GLSA-202012-04 : Mozilla Thunderbird: Multiple vulnerabilitiesNessusGentoo Local Security Checks
high
143494GLSA-202012-03 : Mozilla Firefox: Multiple vulnerabilitiesNessusGentoo Local Security Checks
high
143378Oracle Linux 7 : firefox (ELSA-2020-5239)NessusOracle Linux Local Security Checks
high
143377Oracle Linux 8 : firefox (ELSA-2020-5237)NessusOracle Linux Local Security Checks
high
143372Oracle Linux 8 : thunderbird (ELSA-2020-5236)NessusOracle Linux Local Security Checks
high
143371Scientific Linux Security Update : firefox on SL6.x i686/x86_64 (2020:5257)NessusScientific Linux Local Security Checks
high
143370RHEL 7 : firefox (RHSA-2020:5239)NessusRed Hat Local Security Checks
high
143369RHEL 7 : thunderbird (RHSA-2020:5235)NessusRed Hat Local Security Checks
high
143368Oracle Linux 7 : thunderbird (ELSA-2020-5235)NessusOracle Linux Local Security Checks
high
143366RHEL 6 : firefox (RHSA-2020:5257)NessusRed Hat Local Security Checks
high
143365RHEL 8 : firefox (RHSA-2020:5237)NessusRed Hat Local Security Checks
high
143361Scientific Linux Security Update : thunderbird on SL6.x i686/x86_64 (2020:5238)NessusScientific Linux Local Security Checks
high
143360Scientific Linux Security Update : firefox on SL7.x x86_64 (2020:5239)NessusScientific Linux Local Security Checks
high
143359Scientific Linux Security Update : thunderbird on SL7.x i686/x86_64 (2020:5235)NessusScientific Linux Local Security Checks
high
143357openSUSE Security Update : MozillaThunderbird (openSUSE-2020-2096)NessusSuSE Local Security Checks
high
143352openSUSE Security Update : MozillaFirefox (openSUSE-2020-2020)NessusSuSE Local Security Checks
high
143340openSUSE Security Update : MozillaFirefox (openSUSE-2020-2031)NessusSuSE Local Security Checks
high
143281RHEL 8 : thunderbird (RHSA-2020:5232)NessusRed Hat Local Security Checks
high
143280RHEL 8 : firefox (RHSA-2020:5233)NessusRed Hat Local Security Checks
high
143279RHEL 8 : thunderbird (RHSA-2020:5231)NessusRed Hat Local Security Checks
high
143278RHEL 6 : thunderbird (RHSA-2020:5238)NessusRed Hat Local Security Checks
high
143277RHEL 8 : thunderbird (RHSA-2020:5240)NessusRed Hat Local Security Checks
high
143276RHEL 8 : thunderbird (RHSA-2020:5236)NessusRed Hat Local Security Checks
high
143275RHEL 8 : firefox (RHSA-2020:5234)NessusRed Hat Local Security Checks
high
143267Ubuntu 20.10 : Thunderbird vulnerabilities (USN-4647-1)NessusUbuntu Local Security Checks
high
143224Debian DLA-2464-1 : thunderbird security updateNessusDebian Local Security Checks
high
143191Debian DSA-4796-1 : thunderbird - security updateNessusDebian Local Security Checks
high
143133Debian DLA-2457-1 : firefox-esr security updateNessusDebian Local Security Checks
high
143130Debian DSA-4793-1 : firefox-esr - security updateNessusDebian Local Security Checks
high
143127Ubuntu 16.04 LTS : Firefox vulnerabilities (USN-4637-2)NessusUbuntu Local Security Checks
high
143121Ubuntu 18.04 LTS / 20.04 LTS / 20.10 : Firefox vulnerabilities (USN-4637-1)NessusUbuntu Local Security Checks
high
143059Mozilla Thunderbird < 78.5NessusMacOS X Local Security Checks
high
143058Mozilla Thunderbird < 78.5NessusWindows
high
142913Mozilla Firefox ESR < 78.5NessusWindows
high
142912Mozilla Firefox ESR < 78.5NessusMacOS X Local Security Checks
high
142911Mozilla Firefox < 83.0NessusMacOS X Local Security Checks
high
142910Mozilla Firefox < 83.0NessusWindows
high