CVE-2026-121842 | Mozilla Firefox up to 159.x Reader View privileges management

November 9, 2026 Yanac

A vulnerability was found in Mozilla Firefox up to 159.x. It has been classified as critical. This issue affects some unknown processing of the component Reader View. The manipulation leads to improper privilege management.

This vulnerability is documented as CVE-2026-121842. The attack can be initiated remotely. There is not any exploit available.

Upgrading the affected component is recommended.VulDB Recent EntriesRead More