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Debian Bookworm Firefox-esr Security Advisory DSA-6283-1

debian
Calendar Grey May 20, 2026
Debian Logo
Multiple security issues in Mozilla Firefox-esr could lead to arbitrary code execution and privilege escalation in Debian.
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 code execution information disclosure execution risk firefox-esr bookworm

Summary

For the oldstable distribution (bookworm), these problems have been fixed
in version 140.11.0esr-1~deb12u1.

For the stable distribution (trixie), these problems have been fixed in
version 140.11.0esr-1~deb13u1.

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/



Severity
critical
Lowest
Low
Medium
High
Critical

Package: firefox-esr
CVE ID: CVE-2026-8388 CVE-2026-8391 CVE-2026-8401 CVE-2026-8946

Topics%20covered

Topics Covered

security advisory code execution information disclosure execution risk firefox-esr bookworm

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