CVE-2020-26953

Mozilla: Fullscreen could be enabled without displaying the security UI

Severity Score

4.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Fue posible causar que el navegador entre en modo de pantalla completa sin mostrar la interfaz de seguridad, lo que permite intentar un ataque de phishing o confundir de alguna manera al usuario. Esta vulnerabilidad afecta a Firefox versiones anteriores a 83, Firefox ESR versiones anteriores a 78.5, y Thunderbird versiones anteriores a 78.5

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-10-12 CVE Reserved
2020-11-28 CVE Published
2024-08-04 CVE Updated
2024-10-13 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-451: User Interface (UI) Misrepresentation of Critical Information
CWE-1021: Improper Restriction of Rendered UI Layers or Frames

CAPEC

References (5)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.mozilla.org/security/advisories/mfsa2020-50	2020-12-10
https://www.mozilla.org/security/advisories/mfsa2020-51	2020-12-10
https://www.mozilla.org/security/advisories/mfsa2020-52	2020-12-10
https://access.redhat.com/security/cve/CVE-2020-26953	2020-12-01
https://bugzilla.redhat.com/show_bug.cgi?id=1898733	2020-12-01

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mozilla Search vendor "Mozilla"		Firefox Search vendor "Mozilla" for product "Firefox"				< 83.0 Search vendor "Mozilla" for product "Firefox" and version " < 83.0"		-		Affected
Mozilla Search vendor "Mozilla"		Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"				< 78.5 Search vendor "Mozilla" for product "Firefox Esr" and version " < 78.5"		-		Affected
Mozilla Search vendor "Mozilla"		Thunderbird Search vendor "Mozilla" for product "Thunderbird"				< 78.5 Search vendor "Mozilla" for product "Thunderbird" and version " < 78.5"		-		Affected