CVE-2026-57501: Zen-Browser Desktop

None severity, CVSS 0.0. EPSS: 0.5% chance of exploitation in the next 30 days.

Zen is a firefox-based browser. Prior to 1.21.5b, Zen's glance and split-view context-menu actions, Open link in glance and Split link in new tab, load a page-controlled link URL with the System principal instead of the originating page's principal, allowing a malicious web page to place a link to a file URL that can load with System privileges when opened through either context-menu item and bypass the content-to-file security check that blocks an ordinary click. This issue is fixed in version 1.21.5b.

Affected products

Published 2026-07-09. Last modified 2026-07-10.