CVE-2020-26956

Publication date 17 November 2020

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

6.1 · Medium

Score breakdown

In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

Read the notes from the security team

Status

Package Ubuntu Release Status
firefox 24.04 LTS noble
Fixed 83.0+build2-0ubuntu1
23.10 mantic
Fixed 83.0+build2-0ubuntu1
23.04 lunar
Fixed 83.0+build2-0ubuntu1
22.10 kinetic
Fixed 83.0+build2-0ubuntu1
22.04 LTS jammy
Fixed 83.0+build2-0ubuntu1
21.10 impish
Fixed 83.0+build2-0ubuntu1
21.04 hirsute
Fixed 83.0+build2-0ubuntu1
20.10 groovy
Fixed 83.0+build2-0ubuntu0.20.10.1
20.04 LTS focal
Fixed 83.0+build2-0ubuntu0.20.04.1
18.04 LTS bionic
Fixed 83.0+build2-0ubuntu0.18.04.2
16.04 LTS xenial
Fixed 83.0+build2-0ubuntu0.16.04.3
14.04 LTS trusty Not in release
mozjs38 24.04 LTS noble Not in release
23.10 mantic Not in release
23.04 lunar Not in release
22.10 kinetic Not in release
22.04 LTS jammy Not in release
21.10 impish Not in release
21.04 hirsute Not in release
20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Ignored
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
mozjs52 24.04 LTS noble Not in release
23.10 mantic Not in release
23.04 lunar Not in release
22.10 kinetic Not in release
22.04 LTS jammy Not in release
21.10 impish Not in release
21.04 hirsute Not in release
20.10 groovy Ignored end of life
20.04 LTS focal Ignored
18.04 LTS bionic Ignored
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
mozjs60 24.04 LTS noble Not in release
23.10 mantic Not in release
23.04 lunar Not in release
22.10 kinetic Not in release
22.04 LTS jammy Not in release
21.10 impish Not in release
21.04 hirsute Not in release
20.10 groovy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
mozjs68 24.04 LTS noble Not in release
23.10 mantic Not in release
23.04 lunar Not in release
22.10 kinetic Not in release
22.04 LTS jammy Not in release
21.10 impish Not in release
21.04 hirsute Not in release
20.10 groovy Ignored end of life
20.04 LTS focal Ignored
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
thunderbird 24.04 LTS noble
Fixed 1:78.5.0+build3-0ubuntu1
23.10 mantic
Fixed 1:78.5.0+build3-0ubuntu1
23.04 lunar
Fixed 1:78.5.0+build3-0ubuntu1
22.10 kinetic
Fixed 1:78.5.0+build3-0ubuntu1
22.04 LTS jammy
Fixed 1:78.5.0+build3-0ubuntu1
21.10 impish
Fixed 1:78.5.0+build3-0ubuntu1
21.04 hirsute
Fixed 1:78.5.0+build3-0ubuntu1
20.10 groovy
Fixed 1:78.5.0+build3-0ubuntu0.20.10.1
20.04 LTS focal
Fixed 1:78.7.1+build1-0ubuntu0.20.04.1
18.04 LTS bionic
Fixed 1:78.8.1+build1-0ubuntu0.18.04.1
16.04 LTS xenial Ignored end of standard support, was needs-triage
14.04 LTS trusty Not in release

Notes

tyhicks

mozjs contains a copy of the SpiderMonkey JavaScript engine

Severity score breakdown

Parameter Value
Base score 6.1 · Medium
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Changed
Confidentiality Low
Integrity impact Low
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

Related Ubuntu Security Notices (USN)

    • USN-4637-1
    • Firefox vulnerabilities
    • 18 November 2020
    • USN-4637-2
    • Firefox vulnerabilities
    • 19 November 2020
    • USN-4647-1
    • Thunderbird vulnerabilities
    • 25 November 2020

Other references