CVE-2020-6809
HIGHCVSS 7.5/10EPSS 1.43%
Last modified
CVE-2020-6809 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. When a Web Extension had the all-urls permission and made a fetch request with a mode set to 'same-origin', it was possible for the Web Extension to read local files. This vulnerability affects Firefox < 74.. EPSS estimates a 1.43% chance of exploitation in the next 30 days.
Description
When a Web Extension had the all-urls permission and made a fetch request with a mode set to 'same-origin', it was possible for the Web Extension to read local files. This vulnerability affects Firefox < 74.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 74.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1420296Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-08/Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1420296Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-08/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-6809?
When a Web Extension had the all-urls permission and made a fetch request with a mode set to 'same-origin', it was possible for the Web Extension to read local files. This vulnerability affects Firefox < 74.
How severe is CVE-2020-6809?
CVE-2020-6809 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.43% probability of exploitation in the next 30 days.
How do I fix CVE-2020-6809?
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.
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Are you affected by CVE-2020-6809?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST