CVE-2026-74955

HighCVSS 8.8

Published: 18/08/2026(UTC)Updated: 21/08/2026(UTC)Translated: 19/08/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.22%

13th percentile - higher than 13% of all known CVEs

Summary

Privilege escalation in the Request Handling component in Firefox and Thunderbird. The issue was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

Risk Assessment

The organization is exposed to privilege escalation, which could allow an attacker to gain higher privileges on the system and access sensitive data or resources.

Recommendation

It is recommended to update Firefox and Thunderbird to the latest patched versions.

Original NVD description (English source)

Privilege escalation in the Request Handling component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.