CVE-2021-38506: Medium severity Mozilla Thunderbird vulnerability
Through a series of navigations, Firefox could have entered fullscreen mode without notification or warning to the user. This could lead to spoofing attacks on the browser UI including phishing.
Other sources
Through a series of web navigations, Thunderbird could have entered fullscreen mode without notification or warning to the user. This could lead to spoofing attacks on the browser UI including phishing.
— Mozilla
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/firefoxto a version that resolves this vulnerability.Fixed in 118.0.2-1 - Upgrade
Upgrade
debian/firefox-esrto a version that resolves this vulnerability.Fixed in 91.12.0esr-1~deb10u1Fixed in 115.3.1esr-1~deb10u1Fixed in 102.15.0esr-1~deb11u1Fixed in 115.3.1esr-1~deb11u1Fixed in 102.15.1esr-1~deb12u1Fixed in 115.3.0esr-1~deb12u1Fixed in 115.3.0esr-1Fixed in 115.4.0esr-1 - Upgrade
Upgrade
debian/thunderbirdto a version that resolves this vulnerability.Fixed in 1:91.12.0-1~deb10u1Fixed in 1:115.3.1-1~deb10u1Fixed in 1:102.13.1-1~deb11u1Fixed in 1:115.3.1-1~deb11u1Fixed in 1:102.15.1-1~deb12u1Fixed in 1:115.3.1-1~deb12u1Fixed in 1:115.3.1-1 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 91.3 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 94 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 91.3 - Upgrade
Upgrade
alpine/firefoxto a version that resolves this vulnerability.Fixed in 94.0-r0 - Upgrade
Upgrade
alpine/firefox-esrto a version that resolves this vulnerability.Fixed in 91.3.0-r0 - Upgrade
Upgrade
alpine/librewolfto a version that resolves this vulnerability.Fixed in 94.0-r0 - Upgrade
Upgrade
alpine/thunderbirdto a version that resolves this vulnerability.Fixed in 91.3.2-r0
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the vulnerability ID?
The vulnerability ID is CVE-2021-38506.
What software is affected by this vulnerability?
This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
What is the severity of CVE-2021-38506?
The severity of CVE-2021-38506 is high.
How can this vulnerability be exploited?
This vulnerability can be exploited through a series of navigations, allowing Firefox to enter fullscreen mode without notification or warning to the user.
What is the impact of this vulnerability?
This vulnerability could lead to spoofing attacks on the browser UI, including phishing.