CVE-2020-12391

—

CVSS 3.1

7.5 high

EPSS

1%p70

Published

May 26, 2020 (May 26, 2020)

Modified

Jun 17, 2026

Description

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.

Vendors: mozilla
Products: firefox
Weakness: CWE-863
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

NVD CVE.org GitHub PoCs EPSS (1.4%)

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