CSS Parsing Component Site Isolation Flaw Fixed in Firefox 154 & ESR 153.1
CVE-2026-74986 Published on August 18, 2026
Site isolation issue in the CSS Parsing and Computation component
Site isolation issue in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.
Products Associated with CVE-2026-74986
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Affected Versions
Mozilla Firefox:- Version 153.1, <= 153.* is unaffected.
- Version 154, <= * is unaffected.