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

[SECURITY] [DSA 5485-1] firefox-esr security update

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Debian Security Advisory DSA-5485-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
August 30, 2023 https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2023-4573 CVE-2023-4574 CVE-2023-4575 CVE-2023-4581
CVE-2023-4584

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

For the oldstable distribution (bullseye), these problems have been fixed
in version 102.15.0esr-1~deb11u1.

For the stable distribution (bookworm), these problems have been fixed in
version 102.15.0esr-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/