CVE-2026-8971
MEDIUMCVSS 6.5/10EPSS 0.21%
Last modified
CVE-2026-8971 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.. EPSS estimates a 0.21% chance of exploitation in the next 30 days.
Description
Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 151.0.0 |
| Mozilla | Thunderbird | < 151.0.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2032604Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-46/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-50/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-8971?
Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
How severe is CVE-2026-8971?
CVE-2026-8971 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-8971?
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
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Are you affected by CVE-2026-8971?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST