CVE-2026-16381
CRITICALCVSS 9.1/10EPSS 0.19%
Last modified
CVE-2026-16381 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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.. EPSS estimates a 0.19% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 140.13.0 |
| Mozilla | Firefox | < 153.0.0 |
| Mozilla | Thunderbird | < 140.13.0 |
| Mozilla | Thunderbird | >= 141.0, < 153.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2041001Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-68/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-70/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-71/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-72/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-16381?
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.
How severe is CVE-2026-16381?
CVE-2026-16381 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.
How do I fix CVE-2026-16381?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- Same Subject, Wrong User: A Cross-Issuer Account Takeover in n8nStrix found an identity-binding bug in n8n's token-exchange flow enabling account takeover.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-16376Denial-of-service in the Graphics: WebGPU component. This vu…7.5
- CVE-2026-16377Mitigation bypass in the PDF Viewer component. This vulnerab…9.8
- CVE-2026-16378Other issue in the DOM: Copy & Paste and Drag & Drop compone…7.5
- CVE-2026-16379Privilege escalation in the DOM: Content Processes component…8.8
- CVE-2026-1638A security flaw has been discovered in Tenda AC21 1.1.1.1/1.…8.8
- CVE-2026-16380Mitigation bypass in the Networking component. This vulnerab…9.1
- CVE-2026-16382Mitigation bypass in the DOM: Service Workers component. Thi…9.8
- CVE-2026-16383Mitigation bypass in the DOM: Networking component. This vul…9.8
- CVE-2026-16384Information disclosure due to uninitialized memory in the Gr…7.5
- CVE-2026-16385Information disclosure due to uninitialized memory in the Gr…7.5
- CVE-2026-16386Information disclosure due to uninitialized memory in the Gr…7.5
- CVE-2026-16387Site isolation issue in the Networking component. This vulne…9.8
Are you affected by CVE-2026-16381?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST