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9.8CRITICAL

CVE-2025-8043 — Focus incorrectly truncated URLs towards the beginning instead of around the origin.

Mozilla · Firefox · Published 22 Jul 2025 · Modified 30 Sept 2026

Description

Focus incorrectly truncated URLs towards the beginning instead of around the origin. This vulnerability was fixed in Firefox 141.

References

What to do
  1. Check whether Firefox is in your asset inventory.
  2. Patch in the next maintenance window; prioritise internet-facing systems.
  3. Record the decision in your risk register for audit evidence.
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Link: adminadda.com/cve/CVE-2025-8043