CVE-2026-100819
CriticalCVSS 9.6Summary
Sandbox escape due to incorrect boundary conditions in the XPCOM component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Risk Assessment
A sandbox escape may allow malicious content to execute code outside the browser's isolated environment, threatening user data confidentiality and integrity. The risk affects users of unpatched Firefox versions.
Recommendation
Update Firefox to the latest versions listed in the advisory (Firefox 157, ESR 153.4, ESR 115.42, ESR 140.17). Enforce automatic updates across the organization.
Other vulnerabilities in Firefox
See all- CVE-2026-96869Medium
Information disclosure in the Networking component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.
- CVE-2026-100832High
Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox ESR 153.4, Firefox ESR 115.42, and Firefox ESR 140.17.
- CVE-2026-100831High
Use-after-free in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
- CVE-2026-100830Unknown
Mitigation bypass in the DOM: Navigation component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
- CVE-2026-100829Unknown
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
- CVE-2026-100828Unknown
Mitigation bypass in the Bookmarks & History component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
- CVE-2026-100826Medium
Denial-of-service in the Storage: StorageManager component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
- CVE-2026-100825High
Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
- CVE-2026-100824High
Privilege escalation in the Places component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
- CVE-2026-100822Unknown
Spoofing issue in the Networking: HTTP component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
Original NVD description (English source)
Sandbox escape due to incorrect boundary conditions in the XPCOM component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS