CVE-2019-17020

Description

If an XML file is served with a Content Security Policy and the XML file includes an XSL stylesheet, the Content Security Policy will not be applied to the contents of the XSL stylesheet. If the XSL sheet e.g. includes JavaScript, it would bypass any of the restrictions of the Content Security Policy applied to the XML document. This vulnerability affects Firefox < 72.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.17%
Vendor Advisory ubuntu.com Vendor Advisory mozilla.org
Affected: Mozilla Firefox
Published at:
Updated at:

References

Link Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1597645 permissions required
https://www.mozilla.org/security/advisories/mfsa2020-01/ vendor advisory
https://usn.ubuntu.com/4234-1/ third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2019-17020?
CVE-2019-17020 has been scored as a medium severity vulnerability.
How to fix CVE-2019-17020?
To fix CVE-2019-17020, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-17020 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2019-17020 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2019-17020?
CVE-2019-17020 affects Mozilla Firefox.
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