Medium severity · published Dec 9, 2020
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 or otherwise confuse the…
4.3
CVSS
1.3%
EPSS
No
On KEV
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:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.3% · higher than 70% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 83.0 · source: NVD
FE
Firefox Esr · Mozilla
before 78.5 · source: NVD
TH
Thunderbird · Mozilla
before 78.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-26953
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-26953
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=1656741
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-50/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-51/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-52/
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