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Debian 11 firefox-esr Critical Code Exec Privilege Escalation DLA-4592-1

debian lts
Calendar Grey May 20, 2026
Dist Debian Esm H88
Debian fixes multiple vulnerabilities in Firefox ESR that could allow arbitrary code execution and information disclosure.
Multiple security issues have been found in the Mozilla Firefox web browser, which could potentially result in the execution of arbitrary code, bypass of the same-origin policy, pr...
Topics%20covered

Topics Covered

security advisory debian privilege escalation arbitrary code execution information disclosure web browser

Summary

For Debian 11 bullseye, these problems have been fixed in version
140.11.0esr-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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS


Severity
critical
Lowest
Low
Medium
High
Critical

Package: firefox-esr
Version: 140.11.0esr-1~deb11u1
CVE ID: CVE-2026-8388 CVE-2026-8391 CVE-2026-8401 CVE-2026-8946

Topics%20covered

Topics Covered

security advisory debian privilege escalation arbitrary code execution information disclosure web browser

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