CVE-2026-0881
CRITICALCVSS 10/10EPSS 0.31%
Last modified
CVE-2026-0881 is a critical-severity vulnerability rated 10/10 on the CVSS scale. Sandbox escape in the Messaging System component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.. EPSS estimates a 0.31% chance of exploitation in the next 30 days.
Description
Sandbox escape in the Messaging System component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 147.0 |
| Mozilla | Thunderbird | < 147.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2005845Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-01/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-04/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-0881?
Sandbox escape in the Messaging System component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.
How severe is CVE-2026-0881?
CVE-2026-0881 has a CVSS score of 10/10 (CRITICAL severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.
How do I fix CVE-2026-0881?
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-2026-0881?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST