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CVE-2020-26958 Details
Description
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.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=1669355 | CVE | Issue TrackingPermissions RequiredVendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2020-50/ | CVE | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2020-51/ | CVE | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2020-52/ | CVE | Vendor Advisory |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1669355 | [email protected] | Issue TrackingPermissions RequiredVendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2020-50/ | [email protected] | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2020-51/ | [email protected] | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2020-52/ | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| mozilla firefox | < 83.0 |
CPE
Remediation
| |
| mozilla firefox esr | < 78.5 |
CPE
Remediation
| |
| mozilla thunderbird | < 78.5 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Nov 21, 2024 | CVE Modified | CVE |
| May 14, 2024 | CVE Modified | [email protected] |
| Dec 10, 2020 | Initial Analysis | [email protected] |