CVE-2026-8950Critical· 9.3▾ MidnightSame-origin policy bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 51.2 · likelihood 0 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.2%
Same-origin policy bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
firefox < 140.11.0firefox < 151.0.0thunderbird < 140.11thunderbird < 151.0.0Upgrade past the affected range:
firefox 151.0.0thunderbird 151.0.0Connected by shared product, vendor, weakness, or advisory.
CVE-2025-9180High· 8.1Same-origin policy bypass in the Graphics: Canvas2D component
CVE-2026-100830High· 8.1Mitigation bypass in the DOM: Navigation component
CVE-2026-100821Medium· 4.7Site isolation issue in the Panning and Zooming component
CVE-2026-100816High· 8.1Site isolation issue in the DOM: Networking component
CVE-2026-100809High· 8.1Same-origin policy bypass in the DevTools component
CVE-2026-100803High· 8.1Same-origin policy bypass in the WebExtensions component