Is CVE-2020-26953 in the CISA KEV catalog?

No. CVE-2020-26953 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-26953?

CVE-2020-26953 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2020-26953?

CVE-2020-26953 has an EPSS score of 1.28% (66th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-26953?

Upgrade firefox on debian unstable to 83.0-1 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2020-26953

MEDIUM

4.3

CVSS v3

NVD

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.

CWE-1021

How to fix

Remediation Available

firefoxDebian

Fixed in:83.0-1CVE-2020-26953

firefoxUbuntu

Fixed in:83.0+build2-0ubuntu0.16.04.3USN-4637-2

Fixed in:83.0+build2-0ubuntu0.18.04.2USN-4637-1

Fixed in:83.0+build2-0ubuntu0.20.04.1USN-4637-1

DeveloperEditionWindows application

Affected:83.0Fixed in:83.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:83.0Fixed in:83.0Mozilla

Mozilla Firefox ESR (en-US)Windows application

Affected:78.5Fixed in:78.5Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:78.5Fixed in:78.5Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Exploit Intelligence

1.28%probability of exploitation in 30 days

66thpercentile

Moderate risk: more likely to be exploited than 66% of all known CVEs.

References

Vendor Advisory4

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.