CVE-2020-12391: High severity Mozilla Firefox vulnerability
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
ubuntu/firefoxto a version that resolves this vulnerability.Fixed in 76.0+ - Upgrade
Upgrade
ubuntu/firefoxto a version that resolves this vulnerability.Fixed in 76.0 - Upgrade
Upgrade
debian/firefoxto a version that resolves this vulnerability.Fixed in 130.0-2 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 76 - Upgrade
Upgrade
alpine/firefoxto a version that resolves this vulnerability.Fixed in 76.0-r0 - Upgrade
Upgrade
alpine/librewolfto a version that resolves this vulnerability.Fixed in 76.0-r0
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2020-12391?
CVE-2020-12391 is classified as a moderate severity vulnerability.
How do I fix CVE-2020-12391?
To fix CVE-2020-12391, users should update to Mozilla Firefox version 76 or later.
What versions of Firefox are affected by CVE-2020-12391?
CVE-2020-12391 affects all versions of Mozilla Firefox prior to version 76.
What is the impact of CVE-2020-12391?
CVE-2020-12391 allows execution of blocked scripts through data: URLs in an OBJECT element.
Does CVE-2020-12391 affect other browsers apart from Firefox?
CVE-2020-12391 specifically affects Firefox and is not reported to impact other major browsers.