CVE-2026-100819Critical· 9.6▾ MidnightSandbox 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.
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 52.8 · likelihood 0 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the CISA ADP record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
— → 9.6
none → critical
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.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-96869NoneInformation disclosure in the Networking component
CVE-2026-100832High· 8.8Use-after-free in the Graphics: Canvas2D component
CVE-2026-100821NoneSite isolation issue in the Panning and Zooming component
CVE-2026-100820High· 8.8Privilege escalation in the Address Bar component
CVE-2026-100818Critical· 9.6Sandbox escape due to use-after-free in the Widget: Gtk component
CVE-2026-100811NoneSandbox escape due to use-after-free in the DOM: Core & HTML component