A cryptographic vulnerability was identified in Mozilla Firefox's Security Block-lists, Allow-lists, and other State component. This issue affects versions prior to Firefox 153.5.1-1.oe2403sp3 and related Thunderbird versions. The flaw was addressed in Firefox 158.0.1, Firefox ESR 153.5.1, Firefox ESR 115.43.1, Thunderbird 158.0.1, Thunderbird 153.5.1, and Firefox 158.0.2. The vulnerability has a medium severity rating with a CVSS score of 5.4.