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CVE-2020-26958

Date: December 8, 2020

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.

Severity Score

Related Resources (10)

https://nvd.nist.gov/vuln/detail/CVE-2020-26958
https://access.redhat.com/security/cve/CVE-2020-26958
https://bugzilla.mozilla.org/show_bug.cgi?id=1669355
https://www.mozilla.org/security/advisories/mfsa2020-52/
https://www.mozilla.org/security/advisories/mfsa2020-51/
https://security-tracker.debian.org/tracker/CVE-2020-26958
https://people.canonical.com/~ubuntu-security/cve/CVE-2020-26958
https://www.mozilla.org/security/advisories/mfsa2020-50/
https://security.alpinelinux.org/vuln/CVE-2020-26958
https://www.mend.io/vulnerability-database/CVE-2020-26958

Severity Score

Weakness Type (CWE)

Cross-Site Scripting (XSS)

CWE-79

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): CHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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