CVE-2026-74983

HighCVSS 8.1

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

Exploitation Probability (EPSS)

Low risk

0.17%

7th percentile - higher than 7% of all known CVEs

Summary

Mitigation bypass in the Data Loss Prevention component. Fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Risk Assessment

An attacker may bypass data loss prevention controls, potentially leading to unauthorized information disclosure.

Recommendation

Update Firefox and Thunderbird to the latest ESR or stable versions to apply the fixes.

Original NVD description (English source)

Mitigation bypass in the Data Loss Prevention component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.