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CVE-2026-16387— Site isolation issue in the Networking component

AI Predicted 5.9 Difficulty: Moderate EPSS 0.15% · P5

Possible ATT&CK Techniques 1AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProductVersion RangeStatus
MozillaFirefox140.13≤ 140.*unaffected
153≤ *unaffected
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I. Basic Information for CVE-2026-16387

Vulnerability Information
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Vulnerability Title
Site isolation issue in the Networking component
Source: NVD (National Vulnerability Database)
Vulnerability Description
Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
MozillaFirefox 140.13 ~ 140.* -
MozillaThunderbird 140.13 ~ 140.* -

II. Public POCs for CVE-2026-16387

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III. Intelligence Information for CVE-2026-16387

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Vendor Advisories for CVE-2026-16387 (4)

Same Patch Batch · Mozilla · 2026-07-21 · 64 CVEs total

CVE-2026-16374Information disclosure in the Framework component in DevTools
CVE-2026-16364Incorrect boundary conditions in the Audio/Video: Playback component
CVE-2026-16362Use-after-free in the WebRTC: Audio/Video component
CVE-2026-16352Sandbox escape due to use-after-free in the Disability Access APIs component
CVE-2026-16363JIT miscompilation in the JavaScript: WebAssembly component
CVE-2026-16356Sandbox escape due to use-after-free in the Disability Access APIs component
CVE-2026-16370Mitigation bypass in the DOM: Networking component
CVE-2026-16371Privilege escalation in the DOM: Navigation component
CVE-2026-16372Privilege escalation in the DOM: Content Processes component
CVE-2026-16373Information disclosure in the Privacy component in Firefox for Android
CVE-2026-16357Incorrect boundary conditions in the Graphics component
CVE-2026-16375Site isolation issue in the Networking: HTTP component
CVE-2026-16376Denial-of-service in the Graphics: WebGPU component
CVE-2026-16377Mitigation bypass in the PDF Viewer component
CVE-2026-16378Other issue in the DOM: Copy & Paste and Drag & Drop component
CVE-2026-16379Privilege escalation in the DOM: Content Processes component
CVE-2026-16358Site isolation issue in the Graphics: WebRender component
CVE-2026-16381Same-origin policy bypass in the Networking: DNS component
CVE-2026-16380Mitigation bypass in the Networking component
CVE-2026-16382Mitigation bypass in the DOM: Service Workers component

Showing top 20 of 64 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-16387

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