CVE-2026-8401

Summary

Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.

Affected Software

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: total

firefox: thunderbird: Sandbox escape in the Profile Backup component

Additional References

• https://access.redhat.com/security/cve/CVE-2026-8401
• https://bugzilla.redhat.com/show_bug.cgi?id=2476492
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8401.json
• https://access.redhat.com/errata/RHSA-2026:26551
• https://access.redhat.com/errata/RHSA-2026:27715
• https://access.redhat.com/errata/RHSA-2026:26539
• https://access.redhat.com/errata/RHSA-2026:21380
• https://access.redhat.com/errata/RHSA-2026:22325
• https://access.redhat.com/errata/RHSA-2026:21382
• https://access.redhat.com/errata/RHSA-2026:22643
• https://access.redhat.com/errata/RHSA-2026:26629
• https://access.redhat.com/errata/RHSA-2026:26270
• https://access.redhat.com/errata/RHSA-2026:26606
• https://access.redhat.com/errata/RHSA-2026:26536
• https://access.redhat.com/errata/RHSA-2026:26630
• https://access.redhat.com/errata/RHSA-2026:26268
• https://access.redhat.com/errata/RHSA-2026:26491
• https://access.redhat.com/errata/RHSA-2026:26269
• https://access.redhat.com/errata/RHSA-2026:26493
• https://access.redhat.com/errata/RHSA-2026:26174
• https://access.redhat.com/errata/RHSA-2026:26492
• https://access.redhat.com/errata/RHSA-2026:26521
• https://access.redhat.com/errata/RHSA-2026:21378
• https://access.redhat.com/errata/RHSA-2026:21381

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2038679
• https://www.mozilla.org/security/advisories/mfsa2026-45/
• https://www.mozilla.org/security/advisories/mfsa2026-47/
• https://www.mozilla.org/security/advisories/mfsa2026-48/
• https://www.mozilla.org/security/advisories/mfsa2026-51/

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