Mozilla Firefox, Firefox ESR und Thunderbird: Mehrere Schwachstellen — WID-SEC-2026-1959

Summary

WID-SEC-2026-1959 is a security advisory from BSI. Mozilla Firefox, Firefox ESR und Thunderbird: Mehrere Schwachstellen Reported severity or threat: high. Source updated on 2026-06-19.

Risk context

• Reported severity or threat level: high.

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

WID-SEC-2026-1959

Source

BSI

Published by source

2026-06-17

Last source activity

2026-06-19

Curated by

hlukh.ch

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