A firefox-esr security update has been released for Debian GNU/Linux 11 to address multiple security issues that potentially result in the execution of arbitrary code, information disclosure or spoofing.

DSA 5350-1: firefox-esr security update

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Debian Security Advisory DSA-5350-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
February 15, 2023   https://www.debian.org/security/faq
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Package : firefox-esr
CVE ID : CVE-2023-0767 CVE-2023-25728 CVE-2023-25729 CVE-2023-25730
CVE-2023-25732 CVE-2023-25735 CVE-2023-25737 CVE-2023-25739
CVE-2023-25742 CVE-2023-25744 CVE-2023-25746

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

For the stable distribution (bullseye), these problems have been fixed in
version 102.8.0esr-1~deb11u1.

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/