CVE-2026-8955
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk34th percentile - higher than 34% of all known CVEs
Summary
The vulnerability allows privilege escalation in the DOM: Workers component. It was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Risk Assessment
Privilege escalation may lead to unauthorized access to system resources, posing a serious security threat to the organization.
Recommendation
It is recommended to update to the latest versions of Firefox and Thunderbird to mitigate this vulnerability.
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Original NVD description (English source)
Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

