CVE-2026-74950
HIGHCVSS 8.8/10EPSS 0.22%
Last modified
CVE-2026-74950 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Privilege escalation in the Downloads API component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.. EPSS estimates a 0.22% chance of exploitation in the next 30 days.
Description
Privilege escalation in the Downloads API component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 153.1.0 |
| Mozilla | Firefox | < 154.0.0 |
| Mozilla | Thunderbird | < 153.1.0 |
| Mozilla | Thunderbird | < 154.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1880253Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-74/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-77/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-78/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-80/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-74950?
Privilege escalation in the Downloads API component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
How severe is CVE-2026-74950?
CVE-2026-74950 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.22% probability of exploitation in the next 30 days.
How do I fix CVE-2026-74950?
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-2026-74944Use-after-free in the DOM: Core & HTML component. This vulne…9.8
- CVE-2026-74945Information disclosure in the Graphics: Text component. This…6.5
- CVE-2026-74946Privilege escalation due to incorrect boundary conditions in…8.8
- CVE-2026-74947Privilege escalation due to invalid pointer in the Graphics …8.8
- CVE-2026-74948Information disclosure in the Graphics component. This vulne…6.5
- CVE-2026-74949Privilege escalation due to use-after-free in the Graphics: …8.8
- CVE-2026-74951Clickjacking issue in Firefox for Android. This vulnerabilit…6.5
- CVE-2026-74952Privilege escalation in the Application Update component. Th…8.8
- 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
Are you affected by CVE-2026-74950?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST