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Vulnerability IntelligenceCVE-2026-8948

CVE-2026-8948

CRITICAL9.1

Same-origin policy bypass in the DOM: Networking component

Published May 19, 2026

Modified 2 weeks ago

Details

Same-origin policy bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2038803

https://www.cve.org/CVERecord?id=CVE-2026-8948

https://www.mozilla.org/security/advisories/mfsa2026-46/

https://www.mozilla.org/security/advisories/mfsa2026-50/

CVSS Analysis

CVSS v3.1

9.1

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

NoneA:N

9.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Ecosystems

Timeline

PublishedMay 19, 2026

ModifiedMay 19, 2026

CVE-2026-8948 | Mondoo Vulnerability Intelligence