CVE-2026-74963

MediumCVSS 5.4

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

Exploitation Probability (EPSS)

Low risk

0.12%

3th percentile - higher than 3% of all known CVEs

Summary

Vulnerability in the Networking: Cookies component allows bypassing the same-origin policy. It was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Risk Assessment

Bypassing the same-origin policy in the context of cookies could allow an attacker to steal sessions or manipulate cookies, potentially leading to account takeover.

Recommendation

Update Firefox or Thunderbird to the latest available version that includes the fix.

Original NVD description (English source)

Same-origin policy bypass in the Networking: Cookies 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.