CVE-2026-16375 is a vulnerability in Mozilla Firefox
Published on July 21, 2026
Site isolation issue in the Networking: HTTP component
Site isolation issue in the Networking: HTTP component. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.
Products Associated with CVE-2026-16375
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Affected Versions
Mozilla Firefox:- Version 140.13, <= 140.* is unaffected.
- Version 153, <= * is unaffected.