What’s Vulnerable › Vulnerabilities

CVE-2026-57501: Zen: Context-menu "Open link in glance" / "Split link in new tab" loads a page-controlled link with the System principal, bypassing the web-content scheme restriction

• Severity: none (CVSS 0.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-09 · updated 2026-10-25
• Weakness: CWE-266

Description

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

• zen-browser desktop: before 1.21.5b

References

• https://github.com/zen-browser/desktop/commit/44f7616238208200547c7df500d945752d7b6379
• https://github.com/zen-browser/desktop/releases/tag/1.21.5b
• https://github.com/zen-browser/desktop/security/advisories/GHSA-vpvg-hp3v-rm5q

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