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.oe2403sp4 and was addressed in Firefox 158.0.1 and related ESR and Thunderbird versions. The vulnerability has a CVSS 3.1 base score of 5.4, indicating a medium severity level. No known exploits are reported in the wild.