What is CVE-2020-4070?

CVE-2020-4070 is a medium-severity vulnerability in W3c CSS Validator, classified under Cross-site Scripting. CVSS score: 4.6/10. Published 2020-06-22.

How severe is CVE-2020-4070?

Medium severity. CVSS v3 base score is 4.6 out of 10.

XSS in W3c CSS Validator

CVE-2020-4070

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.005 (42.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.

Affected products

W3c Css_validator
World Wide Web Consortium (W3c) Css Validator — versions <= 54d68a1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2020-4070?: CVE-2020-4070 is a medium-severity vulnerability in W3c CSS Validator, classified under Cross-site Scripting. CVSS score: 4.6/10. Published 2020-06-22.
How severe is CVE-2020-4070?: Medium severity. CVSS v3 base score is 4.6 out of 10.