Multiple security issues have been found in the Mozilla Firefox web browser, which could potentially result in the execution of arbitrary code, sandbox escape, bypass of the same-origin policy, privilege escalation, information disclosure or spoofing.
For Debian 11 bullseye, these problems have been fixed in version 153.6.0esr-1~deb11u1.
We recommend that you upgrade your firefox-esr packages.
Further information about Extended LTS security advisories can be found in the dedicated section of our website.