CVE-2020-26953 — UI Misrepresentation / Clickjacking in Mozilla Firefox

CWE-1021 — UI Misrepresentation / ClickjackingCWE-451 — User Interface (UI) Misrepresentation of Critical Information12 documents8 sources
Severity
4.3MEDIUMNVD
EPSS
0.2%
top 53.84%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird
Timeline
PublishedDec 9
Latest updateMay 24

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:NExploitability: 2.8 | Impact: 1.4

Affected Packages7 packages

▶CVEListV5mozilla/firefox< 83
▶NVDmozilla/firefox< 83.0
▶CVEListV5mozilla/firefox_esr< 78.5
▶CVEListV5mozilla/thunderbird< 78.5

🔴Vulnerability Details

3
GHSA
GHSA-vw8x-xjwp-7888: 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↗2022-05-24
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CVEList
CVE-2020-26953: 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↗2020-12-09
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OSV
CVE-2020-26953: 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↗2020-12-09
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📋Vendor Advisories

8
Ubuntu
Thunderbird vulnerabilities↗2020-11-25
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Ubuntu
Firefox vulnerabilities↗2020-11-19
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Ubuntu
Firefox vulnerabilities↗2020-11-18
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Red Hat
Mozilla: Fullscreen could be enabled without displaying the security UI↗2020-11-17
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Debian
CVE-2020-26953: firefox - It was possible to cause the browser to enter fullscreen mode without displaying...↗2020
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CVE-2020-26953 — UI Misrepresentation / Clickjacking | cvebase