CVE-2020-26958

Firefox did not block execution of scripts with incorrect MIME types when the response was intercepted and cached through a ServiceWorker

published December 9, 2020

CVSS
—
EPSS
1%
Percentile
71.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.01364 · 71.6th percentile
Published
2020-12-09T00:22Z
EPSS history
Timeline
  • 09 DEC 00:22Z
    Firefox did not block execution of scripts with incorrect MIME types when the response was intercepted and cached through a ServiceWorker
    cvelistv5