CVE-2020-6808

Name: CVE-2020-6808
Creator: NVD / NIST
Published: 2020-03-25T22:15:12.56+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.04%

Last modified Jun 17, 2026

CVE-2020-6808 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. When a JavaScript URL (javascript:) is evaluated and the result is a string, this string is parsed to create an HTML document, which is then presented. Previously, this document's URL (as reported by the document.location property, for example) was the originating javascript: URL which could lead to spoofing attacks; it is now correctly the URL of the originating document. EPSS estimates a 1.04% chance of exploitation in the next 30 days.

Description

When a JavaScript URL (javascript:) is evaluated and the result is a string, this string is parsed to create an HTML document, which is then presented. Previously, this document's URL (as reported by the document.location property, for example) was the originating javascript: URL which could lead to spoofing attacks; it is now correctly the URL of the originating document. This vulnerability affects Firefox < 74.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

EPSS Probability

1.04%

59.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-290

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 74.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1247968Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2020-08/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1247968Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2020-08/Vendor Advisory

Timeline

Published: Mar 25, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-6808?

How severe is CVE-2020-6808?

CVE-2020-6808 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.04% probability of exploitation in the next 30 days.

How do I fix CVE-2020-6808?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-6808?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST