CVE-2026-16365
HIGHCVSS 8.8/10EPSS 0.27%
Last modified
CVE-2026-16365 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153, Thunderbird 153, Firefox ESR 140.15, and Thunderbird 140.15.. EPSS estimates a 0.27% chance of exploitation in the next 30 days.
Description
Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153, Thunderbird 153, Firefox ESR 140.15, and Thunderbird 140.15.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 153.0.0 |
| Mozilla | Thunderbird | < 153.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2049149Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-68/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-71/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-16365?
Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153, Thunderbird 153, Firefox ESR 140.15, and Thunderbird 140.15.
How severe is CVE-2026-16365?
CVE-2026-16365 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.
How do I fix CVE-2026-16365?
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.
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Are you affected by CVE-2026-16365?
Run a free Strix scan to check your systems for this vulnerability.
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