CVE-2026-74959
Last modified
CVE-2026-74959 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. Mitigation bypass in the Storage: Cache API component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.. EPSS estimates a 0.16% chance of exploitation in the next 30 days.
Description
Mitigation bypass in the Storage: Cache API component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | All versions |
| Mozilla | Thunderbird | All versions |
References
Timeline
- Published
- Last Modified
- Status
- Undergoing Analysis
Frequently Asked Questions
What is CVE-2026-74959?
How severe is CVE-2026-74959?
How do I fix CVE-2026-74959?
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-2026-74953Privilege escalation in the Networking: Cookies component. T…8.8
- CVE-2026-74954Information disclosure due to side-channel in the Storage: C…7.5
- CVE-2026-74955Privilege escalation in the Request Handling component. This…8.8
- CVE-2026-74956Same-origin policy bypass in the DOM: Service Workers compon…9.1
- CVE-2026-74957Mitigation bypass in the Safe Browsing component. This vulne…8.1
- CVE-2026-74958Information disclosure in the WebRTC component. This vulnera…7.5
- CVE-2026-74960Site isolation issue in the WebExtensions component. This vu…8.1
- CVE-2026-74961Side-channel in the Web Audio component. This vulnerability …9.1
- CVE-2026-74962Site isolation issue in the Networking: Cookies component. T…8.1
- CVE-2026-74963Same-origin policy bypass in the Networking: Cookies compone…5.4
- CVE-2026-74964Integer overflow in the Graphics component. This vulnerabili…9.8
- CVE-2026-74965Privilege escalation in the Shell Integration component. Thi…8.8
Are you affected by CVE-2026-74959?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST