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CVE-2026-16381 | Mondoo Vulnerability Intelligence

Vulnerability IntelligenceCVE-2026-16381

CVE-2026-16381

CRITICAL9.1

Same-origin policy bypass in the Networking: DNS component

Published Jul 21, 2026

Modified 3 days ago

Details

Same-origin policy bypass in the Networking: DNS component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2041001

https://www.cve.org/CVERecord?id=CVE-2026-16381

https://www.mozilla.org/security/advisories/mfsa2026-68/

https://www.mozilla.org/security/advisories/mfsa2026-70/

https://www.mozilla.org/security/advisories/mfsa2026-71/

https://www.mozilla.org/security/advisories/mfsa2026-72/

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

PublishedJul 21, 2026

ModifiedJul 22, 2026