CVE-2020-26953medium
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/
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
Vulnerable Software
Configuration 1
OR
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
Tenable Plugins
| ID | Name | Product | Family | Severity |
|---|---|---|---|---|
| 150523 | SUSE SLES11 Security Update : MozillaFirefox (SUSE-SU-2020:14548-1) | Nessus | SuSE Local Security Checks | high |
| 149335 | NewStart CGSL CORE 5.04 / MAIN 5.04 : thunderbird Multiple Vulnerabilities (NS-SA-2021-0025) | Nessus | NewStart CGSL Local Security Checks | high |
| 147399 | NewStart CGSL CORE 5.04 / MAIN 5.04 : firefox Multiple Vulnerabilities (NS-SA-2021-0018) | Nessus | NewStart CGSL Local Security Checks | high |
| 147352 | NewStart CGSL MAIN 6.02 : firefox Multiple Vulnerabilities (NS-SA-2021-0065) | Nessus | NewStart CGSL Local Security Checks | high |
| 147286 | NewStart CGSL MAIN 6.02 : thunderbird Multiple Vulnerabilities (NS-SA-2021-0081) | Nessus | NewStart CGSL Local Security Checks | high |
| 146200 | Oracle Linux 6 : firefox (ELSA-2020-5257) | Nessus | Oracle Linux Local Security Checks | high |
| 146197 | Oracle Linux 6 : thunderbird (ELSA-2020-5238) | Nessus | Oracle Linux Local Security Checks | high |
| 145963 | CentOS 8 : firefox (CESA-2020:5237) | Nessus | CentOS Local Security Checks | high |
| 145368 | openSUSE Security Update : MozillaFirefox (openSUSE-2020-2315) | Nessus | SuSE Local Security Checks | high |
| 145070 | RHEL 8 : firefox (RHSA-2020:5314) | Nessus | Red Hat Local Security Checks | high |
| 144798 | Amazon Linux 2 : thunderbird (ALAS-2021-1586) | Nessus | Amazon Linux Local Security Checks | high |
| 144004 | CentOS 7 : firefox (CESA-2020:5239) | Nessus | CentOS Local Security Checks | high |
| 143910 | CentOS 7 : thunderbird (CESA-2020:5235) | Nessus | CentOS Local Security Checks | high |
| 143745 | SUSE SLED15 / SLES15 Security Update : MozillaFirefox (SUSE-SU-2020:3383-1) | Nessus | SuSE Local Security Checks | high |
| 143741 | SUSE SLES12 Security Update : MozillaFirefox (SUSE-SU-2020:3548-1) | Nessus | SuSE Local Security Checks | high |
| 143723 | SUSE SLED15 / SLES15 Security Update : MozillaFirefox (SUSE-SU-2020:3458-1) | Nessus | SuSE Local Security Checks | high |
| 143540 | openSUSE Security Update : MozillaThunderbird (openSUSE-2020-2187) | Nessus | SuSE Local Security Checks | high |
| 143531 | GLSA-202012-04 : Mozilla Thunderbird: Multiple vulnerabilities | Nessus | Gentoo Local Security Checks | high |
| 143494 | GLSA-202012-03 : Mozilla Firefox: Multiple vulnerabilities | Nessus | Gentoo Local Security Checks | high |
| 143378 | Oracle Linux 7 : firefox (ELSA-2020-5239) | Nessus | Oracle Linux Local Security Checks | high |
| 143377 | Oracle Linux 8 : firefox (ELSA-2020-5237) | Nessus | Oracle Linux Local Security Checks | high |
| 143372 | Oracle Linux 8 : thunderbird (ELSA-2020-5236) | Nessus | Oracle Linux Local Security Checks | high |
| 143371 | Scientific Linux Security Update : firefox on SL6.x i686/x86_64 (2020:5257) | Nessus | Scientific Linux Local Security Checks | high |
| 143370 | RHEL 7 : firefox (RHSA-2020:5239) | Nessus | Red Hat Local Security Checks | high |
| 143369 | RHEL 7 : thunderbird (RHSA-2020:5235) | Nessus | Red Hat Local Security Checks | high |
| 143368 | Oracle Linux 7 : thunderbird (ELSA-2020-5235) | Nessus | Oracle Linux Local Security Checks | high |
| 143366 | RHEL 6 : firefox (RHSA-2020:5257) | Nessus | Red Hat Local Security Checks | high |
| 143365 | RHEL 8 : firefox (RHSA-2020:5237) | Nessus | Red Hat Local Security Checks | high |
| 143361 | Scientific Linux Security Update : thunderbird on SL6.x i686/x86_64 (2020:5238) | Nessus | Scientific Linux Local Security Checks | high |
| 143360 | Scientific Linux Security Update : firefox on SL7.x x86_64 (2020:5239) | Nessus | Scientific Linux Local Security Checks | high |
| 143359 | Scientific Linux Security Update : thunderbird on SL7.x i686/x86_64 (2020:5235) | Nessus | Scientific Linux Local Security Checks | high |
| 143357 | openSUSE Security Update : MozillaThunderbird (openSUSE-2020-2096) | Nessus | SuSE Local Security Checks | high |
| 143352 | openSUSE Security Update : MozillaFirefox (openSUSE-2020-2020) | Nessus | SuSE Local Security Checks | high |
| 143340 | openSUSE Security Update : MozillaFirefox (openSUSE-2020-2031) | Nessus | SuSE Local Security Checks | high |
| 143281 | RHEL 8 : thunderbird (RHSA-2020:5232) | Nessus | Red Hat Local Security Checks | high |
| 143280 | RHEL 8 : firefox (RHSA-2020:5233) | Nessus | Red Hat Local Security Checks | high |
| 143279 | RHEL 8 : thunderbird (RHSA-2020:5231) | Nessus | Red Hat Local Security Checks | high |
| 143278 | RHEL 6 : thunderbird (RHSA-2020:5238) | Nessus | Red Hat Local Security Checks | high |
| 143277 | RHEL 8 : thunderbird (RHSA-2020:5240) | Nessus | Red Hat Local Security Checks | high |
| 143276 | RHEL 8 : thunderbird (RHSA-2020:5236) | Nessus | Red Hat Local Security Checks | high |
| 143275 | RHEL 8 : firefox (RHSA-2020:5234) | Nessus | Red Hat Local Security Checks | high |
| 143267 | Ubuntu 20.10 : Thunderbird vulnerabilities (USN-4647-1) | Nessus | Ubuntu Local Security Checks | high |
| 143224 | Debian DLA-2464-1 : thunderbird security update | Nessus | Debian Local Security Checks | high |
| 143191 | Debian DSA-4796-1 : thunderbird - security update | Nessus | Debian Local Security Checks | high |
| 143133 | Debian DLA-2457-1 : firefox-esr security update | Nessus | Debian Local Security Checks | high |
| 143130 | Debian DSA-4793-1 : firefox-esr - security update | Nessus | Debian Local Security Checks | high |
| 143127 | Ubuntu 16.04 LTS : Firefox vulnerabilities (USN-4637-2) | Nessus | Ubuntu Local Security Checks | high |
| 143121 | Ubuntu 18.04 LTS / 20.04 LTS / 20.10 : Firefox vulnerabilities (USN-4637-1) | Nessus | Ubuntu Local Security Checks | high |
| 143059 | Mozilla Thunderbird < 78.5 | Nessus | MacOS X Local Security Checks | high |
| 143058 | Mozilla Thunderbird < 78.5 | Nessus | Windows | high |
| 142913 | Mozilla Firefox ESR < 78.5 | Nessus | Windows | high |
| 142912 | Mozilla Firefox ESR < 78.5 | Nessus | MacOS X Local Security Checks | high |
| 142911 | Mozilla Firefox < 83.0 | Nessus | MacOS X Local Security Checks | high |
| 142910 | Mozilla Firefox < 83.0 | Nessus | Windows | high |