What is CVE-2020-12391?

CVE-2020-12391 is a high-severity vulnerability in Mozilla Firefox, classified under Incorrect Authorization. CVSS score: 7.5/10. Published 2020-05-26.

How severe is CVE-2020-12391?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Mozilla Firefox

CVE-2020-12391

Documents formed using data: URLs in an OBJECT element failed to inherit the CSP of the creating context. This allowed the execution of scripts that should have been blocked, albeit with a unique opaque origin. This vulnerability affects Firefox < 76.

Vulnerability class: Broken Access Control

EPSS: 0.014 (68.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Mozilla Firefox — versions unspecified

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

security@mozilla.org (x_refsource_MISC, Vendor Advisory)
security@mozilla.org (Permissions Required, x_refsource_MISC)

Frequently asked questions

What is CVE-2020-12391?: CVE-2020-12391 is a high-severity vulnerability in Mozilla Firefox, classified under Incorrect Authorization. CVSS score: 7.5/10. Published 2020-05-26.
How severe is CVE-2020-12391?: High severity. CVSS v3 base score is 7.5 out of 10.