CVE-2020-12391

HIGH

Firefox < 76.0 - Cross-Origin Script Execution via data: URL in OBJECT Element

Title source: llm
STIX 2.1

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.

References (2)

Core 2
Core References
Permissions Required x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1457100

Scores

CVSS v3 7.5
EPSS 0.0070
EPSS Percentile 72.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Details

CWE
CWE-863
Status published
Products (1)
mozilla/firefox < 76.0
Published May 26, 2020
Tracked Since Feb 18, 2026