CVE-2020-26958
critical
CVSS v3
—
CVSS v2
—
VIR risk
9.5
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.
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2020-26958
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2020-26958.html
Vendor advisory: arch — https://security.archlinux.org/ASA-202011-12
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | fixed | 83.0-1 | |
| sles | affected | | |
| debian | sid | fixed | 83.0-1 |
| debian | bookworm | fixed | 78.5.0esr-1 |
| debian | bullseye | fixed | 78.5.0esr-1 |
| debian | forky | fixed | 78.5.0esr-1 |
| debian | trixie | fixed | 78.5.0esr-1 |
References
Verify integrity in audit chain (admin only). AS-IS.