A firefox-esr security update has been released for Debian GNU/Linux 11 and 12 to address multiple security issues.

[SECURITY] [DSA 5561-1] firefox-esr security update

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Debian Security Advisory DSA-5561-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
November 22, 2023 https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2023-6204 CVE-2023-6205 CVE-2023-6206 CVE-2023-6207
CVE-2023-6208 CVE-2023-6209 CVE-2023-6212

Multiple security issues have been found in the Mozilla Firefox web
browser, which could potentially result in the execution of arbitrary
code, information leaks or clickjacking.

For the oldstable distribution (bullseye), these problems have been fixed
in version 115.5.0esr-1~deb11u1.

For the stable distribution (bookworm), these problems have been fixed in
version 115.5.0esr-1~deb12u1.

We recommend that you upgrade your firefox-esr packages.

For the detailed security status of firefox-esr please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/firefox-esr

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/