CVE-2020-4070: Cross-site Scripting in CSS Validator
First published: Mon Jun 22 2020(Updated: )
In CSS Validator less than or equal to commit 54d68a1, there is a cross-site scripting vulnerability in handling URIs. A user would have to click on a specifically crafted validator link to trigger it. This has been patched in commit e5c09a9.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| W3C CSS Validator | <=2020-01-19 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2020-4070?
CVE-2020-4070 is classified as a cross-site scripting vulnerability that can potentially allow attackers to execute malicious scripts in a user's browser.
How do I fix CVE-2020-4070?
To fix CVE-2020-4070, update the W3C CSS Validator to a version that includes the patch from commit e5c09a9 or later.
What software versions are affected by CVE-2020-4070?
CVE-2020-4070 affects W3C CSS Validator versions less than or equal to commit 54d68a1.
How is CVE-2020-4070 exploited?
CVE-2020-4070 can be exploited when a user clicks on a specifically crafted validator link that triggers the cross-site scripting vulnerability.
Is CVE-2020-4070 still a threat after the patch?
No, CVE-2020-4070 should not pose a threat if the W3C CSS Validator has been updated to include the patch.
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