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Vulnerability IntelligenceCVE-2026-8950

CVE-2026-8950

CRITICAL9.3

Same-origin policy bypass in the Networking: HTTP component

Published May 19, 2026

Modified 1 weeks ago

Details

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.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1965430

https://www.cve.org/CVERecord?id=CVE-2026-8950

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

https://www.mozilla.org/security/advisories/mfsa2026-48/

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

https://www.mozilla.org/security/advisories/mfsa2026-51/

CVSS Analysis

CVSS v3.1

9.3

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

RequiredUI:R

Scope

Scope

ChangedS:C

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

NoneA:N

9.3/CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Ecosystems

Timeline

PublishedMay 19, 2026

ModifiedMay 19, 2026

CVE-2026-8950 | Mondoo Vulnerability Intelligence