CVE-2020-26953 - Mozilla: Fullscreen could be enabled without displaying the security UI

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MEDIUM

Mozilla: Fullscreen could be enabled without displaying the security UI

Published Dec 9, 2020

4.3

MEDIUM

CVSS 3.1

EPSS 1.29%

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.

Affected products

Vendor Mozilla Product Firefox Default
n/a
- Version
  < 83
  Status
  affected
  Constraints
  -
Vendor Mozilla Product Firefox ESR Default
n/a
- Version
  < 78.5
  Status
  affected
  Constraints
  -
Vendor Mozilla Product Thunderbird Default
n/a
- Version
  < 78.5
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Mozilla

Firefox

n/a

Version	Status	Constraints
< 83	affected	-

Mozilla

Firefox ESR

n/a

Version	Status	Constraints
< 78.5	affected	-

Mozilla

Thunderbird

n/a

Version	Status	Constraints
< 78.5	affected	-

Red Hat Enterprise Linux 6

firefox-0:78.5.0-1.el6_10

Fixed · RHSA-2020:5257
Red Hat Enterprise Linux 6

thunderbird-0:78.5.0-1.el6_10

Fixed · RHSA-2020:5238
Red Hat Enterprise Linux 7

firefox-0:78.5.0-1.el7_9

Fixed · RHSA-2020:5239
Red Hat Enterprise Linux 7

thunderbird-0:78.5.0-1.el7_9

Fixed · RHSA-2020:5235
Red Hat Enterprise Linux 8

firefox-0:78.5.0-1.el8_3

Fixed · RHSA-2020:5237
Red Hat Enterprise Linux 8

thunderbird-0:78.5.0-1.el8_3

Fixed · RHSA-2020:5236
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions

firefox-0:78.5.0-1.el8_0

Fixed · RHSA-2020:5314
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions

thunderbird-0:78.5.0-1.el8_0

Fixed · RHSA-2020:5240
Red Hat Enterprise Linux 8.1 Extended Update Support

firefox-0:78.5.0-1.el8_1

Fixed · RHSA-2020:5233
Red Hat Enterprise Linux 8.1 Extended Update Support

thunderbird-0:78.5.0-1.el8_1

Fixed · RHSA-2020:5231
Red Hat Enterprise Linux 8.2 Extended Update Support

firefox-0:78.5.0-1.el8_2

Fixed · RHSA-2020:5234
Red Hat Enterprise Linux 8.2 Extended Update Support

thunderbird-0:78.5.0-1.el8_2

Fixed · RHSA-2020:5232
Red Hat Enterprise Linux 5

firefox

Out of support scope

Product	Package	State	Advisory
Red Hat Enterprise Linux 6	firefox-0:78.5.0-1.el6_10	Fixed	RHSA-2020:5257
Red Hat Enterprise Linux 6	thunderbird-0:78.5.0-1.el6_10	Fixed	RHSA-2020:5238
Red Hat Enterprise Linux 7	firefox-0:78.5.0-1.el7_9	Fixed	RHSA-2020:5239
Red Hat Enterprise Linux 7	thunderbird-0:78.5.0-1.el7_9	Fixed	RHSA-2020:5235
Red Hat Enterprise Linux 8	firefox-0:78.5.0-1.el8_3	Fixed	RHSA-2020:5237
Red Hat Enterprise Linux 8	thunderbird-0:78.5.0-1.el8_3	Fixed	RHSA-2020:5236
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions	firefox-0:78.5.0-1.el8_0	Fixed	RHSA-2020:5314
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions	thunderbird-0:78.5.0-1.el8_0	Fixed	RHSA-2020:5240
Red Hat Enterprise Linux 8.1 Extended Update Support	firefox-0:78.5.0-1.el8_1	Fixed	RHSA-2020:5233
Red Hat Enterprise Linux 8.1 Extended Update Support	thunderbird-0:78.5.0-1.el8_1	Fixed	RHSA-2020:5231
Red Hat Enterprise Linux 8.2 Extended Update Support	firefox-0:78.5.0-1.el8_2	Fixed	RHSA-2020:5234
Red Hat Enterprise Linux 8.2 Extended Update Support	thunderbird-0:78.5.0-1.el8_2	Fixed	RHSA-2020:5232
Red Hat Enterprise Linux 5	firefox	Out of support scope	n/a

Remediation

No remediation recorded yet.

Weaknesses (2)

CWE-1021

CWE-451

References (9)

https://access.redhat.com/security/cve/CVE-2020-26953
Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1656741
x_refsource_MISCIssue TrackingPermissions RequiredVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1898733
Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2020-26953
https://www.cve.org/CVERecord?id=CVE-2020-26953
https://www.mozilla.org/en-US/security/advisories/mfsa2020-51/#CVE-2020-26953
https://www.mozilla.org/security/advisories/mfsa2020-50/
x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-51/
x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-52/
x_refsource_CONFIRMVendor Advisory

Link	Providers	Tags
https://access.redhat.com/security/cve/CVE-2020-26953		Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1656741		x_refsource_MISCIssue TrackingPermissions RequiredVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1898733		Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2020-26953
https://www.cve.org/CVERecord?id=CVE-2020-26953
https://www.mozilla.org/en-US/security/advisories/mfsa2020-51/#CVE-2020-26953
https://www.mozilla.org/security/advisories/mfsa2020-50/		x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-51/		x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-52/		x_refsource_CONFIRMVendor Advisory