CVE-2020-26967

MEDIUM
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Description

When listening for page changes with a Mutation Observer, a malicious web page could confuse Firefox Screenshots into interacting with elements other than those that it injected into the page. This would lead to internal errors and unexpected behavior in the Screenshots code. This vulnerability affects Firefox < 83.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1665820

https://www.mozilla.org/security/advisories/mfsa2020-50/

Details

Source: MITRE

Published: 2020-12-09

Updated: 2020-12-10

Risk Information

CVSS v2

Base Score: 4.3

Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N

Impact Score: 2.9

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3

Base Score: 6.5

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

Impact Score: 3.6

Exploitability Score: 2.8

Severity: MEDIUM

Vulnerable Software

Configuration 1

OR

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

Tenable Plugins

View all (4 total)

IDNameProductFamilySeverity
143127Ubuntu 16.04 LTS : Firefox vulnerabilities (USN-4637-2)NessusUbuntu Local Security Checks
high
143121Ubuntu 18.04 LTS / 20.04 LTS / 20.10 : Firefox vulnerabilities (USN-4637-1)NessusUbuntu Local Security Checks
high
142911Mozilla Firefox < 83.0NessusMacOS X Local Security Checks
high
142910Mozilla Firefox < 83.0NessusWindows
high