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ubuntucveUbuntu.comUB:CVE-2020-26958
HistoryNov 17, 2020 - 12:00 a.m.

CVE-2020-26958

2020-11-1700:00:00
ubuntu.com
ubuntu.com
22
firefox
mime types
serviceworker
cross-site script inclusion vulnerability
content security policy
thunderbird

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

CVSS3

6.1

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

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

EPSS

0.001

Percentile

48.7%

JSON

Firefox did not block execution of scripts with incorrect MIME types when
the response was intercepted and cached through a ServiceWorker. This could
lead to a cross-site script inclusion vulnerability, or a Content Security
Policy bypass. This vulnerability affects Firefox < 83, Firefox ESR < 78.5,
and Thunderbird < 78.5.

Notes

Author Note
tyhicks mozjs contains a copy of the SpiderMonkey JavaScript engine
OSVersionArchitecturePackageVersionFilename
ubuntu16.04noarchfirefox< 83.0+build2-0ubuntu0.16.04.3UNKNOWN
ubuntu23.04noarchfirefox< 83.0+build2-0ubuntu1UNKNOWN
ubuntu18.04noarchfirefox< 83.0+build2-0ubuntu0.18.04.2UNKNOWN
ubuntu20.04noarchfirefox< 83.0+build2-0ubuntu0.20.04.1UNKNOWN
ubuntu20.10noarchfirefox< 83.0+build2-0ubuntu0.20.10.1UNKNOWN
ubuntu21.04noarchfirefox< 83.0+build2-0ubuntu1UNKNOWN
ubuntu21.10noarchfirefox< 83.0+build2-0ubuntu1UNKNOWN
ubuntu22.04noarchfirefox< 83.0+build2-0ubuntu1UNKNOWN
ubuntu22.10noarchfirefox< 83.0+build2-0ubuntu1UNKNOWN
ubuntu23.10noarchfirefox< 83.0+build2-0ubuntu1UNKNOWN
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1-10 of 211

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veracode
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Content Security Bypass
2020-11-20 09:43:17
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Mozilla Firefox: Multiple vulnerabilities
2020-12-07 00:00:00
Mozilla Thunderbird: Multiple vulnerabilities
2020-12-07 00:00:00
redhat
redhat
(RHSA-2020:5314) Important: firefox security update
2020-12-01 15:12:08
(RHSA-2020:5257) Important: firefox security update
2020-11-30 19:08:04
(RHSA-2020:5231) Important: thunderbird security update
2020-11-30 08:15:46
nessus
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Debian DLA-2457-1 : firefox-esr security update
2020-11-20 00:00:00
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2020-12-01 00:00:00
RHEL 6 : firefox (RHSA-2020:5257)
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debian
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[SECURITY] [DLA 2457-1] firefox-esr security update
2020-11-19 10:07:14
[SECURITY] [DLA 2464-1] thunderbird security update
2020-11-23 09:55:28
[SECURITY] [DSA 4793-1] firefox-esr security update
2020-11-18 18:44:22
mageia
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Updated thunderbird packages fix security vulnerabilities
2020-11-21 15:21:00
Updated firefox and nss packages fix security vulnerabilities
2020-11-19 11:52:41
oraclelinux
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firefox security update
2020-12-01 00:00:00
thunderbird security update
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firefox security update
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thunderbird - security update
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Mozilla Firefox ESR Security Advisories (MFSA2020-50, MFSA2020-52) - Mac OS X
2020-11-18 00:00:00
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2020-11-20 00:00:00
Mageia: Security Advisory (MGASA-2020-0427)
2022-01-28 00:00:00
ibm
ibm
Security Bulletin: Multiple vulnerabilities of Mozilla Firefox (less than Firefox 78.5 ESR + CVE-2020-26951) have affected Synthetic Playback Agent 8.1.4.0-8.1.4 IF11 + ICAM2019.3.0 - 2020.2.0
2021-02-25 07:21:06
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Security update for MozillaThunderbird (important)
2020-12-07 00:00:00
Security update for MozillaFirefox (important)
2020-11-26 00:00:00
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KLA12012 Multiple vulnerabilities in Mozilla Thunderbird
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KLA12010 Multiple vulnerabilities in Mozilla Firefox
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altlinux
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Security fix for the ALT Linux 10 package firefox-esr version 78.5.0-alt1
2020-11-16 00:00:00
Security fix for the ALT Linux 10 package thunderbird version 78.5.0-alt1
2020-11-19 00:00:00
mozilla
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Security Vulnerabilities fixed in Firefox ESR 78.5 — Mozilla
2020-11-17 00:00:00
Security Vulnerabilities fixed in Thunderbird 78.5 — Mozilla
2020-11-17 00:00:00
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2020-11-17 00:00:00
ubuntu
ubuntu
Thunderbird vulnerabilities
2020-11-25 00:00:00
Firefox vulnerabilities
2020-11-19 00:00:00
Firefox vulnerabilities
2020-11-18 00:00:00
archlinux
archlinux
[ASA-202011-12] firefox: multiple issues
2020-11-17 00:00:00
amazon
amazon
Important: thunderbird
2021-01-05 23:35:00
rosalinux
rosalinux
Advisory ROSA-SA-2021-1835
2021-07-02 16:43:38

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

CVSS3

6.1

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

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

EPSS

0.001

Percentile

48.7%

JSON
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