CVE-2026-2784
CRITICALCVSS 9.8/10EPSS 0.43%
Last modified
CVE-2026-2784 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.. EPSS estimates a 0.43% chance of exploitation in the next 30 days.
Description
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 140.8.0 |
| Mozilla | Firefox | < 148.0 |
| Mozilla | Thunderbird | < 140.8.0 |
| Mozilla | Thunderbird | < 148.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2012984Issue Tracking, Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-13/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-15/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-16/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-17/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-2784?
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
How severe is CVE-2026-2784?
CVE-2026-2784 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.43% probability of exploitation in the next 30 days.
How do I fix CVE-2026-2784?
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
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- 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-2026-27834Piwigo is an open source photo gallery application for the w…7.2
- CVE-2026-27835wger is a free, open-source workout and fitness manager. In …4.3
- CVE-2026-27836phpMyFAQ is an open source FAQ web application. Prior to ver…7.5
- CVE-2026-27837Dottie provides nested object access and manipulation in Jav…9.8
- CVE-2026-27838wger is a free, open-source workout and fitness manager. Fiv…3.5
- CVE-2026-27839wger is a free, open-source workout and fitness manager. In …4.3
- CVE-2026-27840ZITADEL is an open source identity management platform. Star…4.3
- CVE-2026-27841A vulnerability in SenseLive X3050's web management interfac…8.4
- CVE-2026-27842Authentication bypass issue exists in MR-GM5L-S1 and MR-GM5A…9.8
- CVE-2026-27843A vulnerability exists in SenseLive X3050's web management i…9.2
- CVE-2026-27844Uncaught Exception (CWE-248) in the Controller 6000 and Cont…2.7
- CVE-2026-27846Due to missing authentication, a user with physical access t…6.2
Are you affected by CVE-2026-2784?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST